You searched for subject:(Physics AND Astronomy).
Showing records 1 – 30 of
2544 total matches.
◁ [1] [2] [3] [4] [5] … [85] ▶
University of Minnesota
1.
Balmer, Alden Michael.
A search for active galactic nuclei neutrinos using the
MINOS detector.
Degree: 2011, University of Minnesota
URL: http://purl.umn.edu/104134 
University of Minnesota. M.S. thesis. January 2011.
Major: Physics & Astronomy. Advisor: Professor Marvin L.
Marshak. 1 computer file (PDF); viii, 33 pages.
Abstract summary not available
Subjects/Keywords: Physics & Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Balmer, A. M. (2011). A search for active galactic nuclei neutrinos using the
MINOS detector. (Masters Thesis). University of Minnesota. Retrieved from http://purl.umn.edu/104134
Chicago Manual of Style (16th Edition):
Balmer, Alden Michael. “A search for active galactic nuclei neutrinos using the
MINOS detector.” 2011. Masters Thesis, University of Minnesota. Accessed February 28, 2021.
http://purl.umn.edu/104134.
MLA Handbook (7th Edition):
Balmer, Alden Michael. “A search for active galactic nuclei neutrinos using the
MINOS detector.” 2011. Web. 28 Feb 2021.
Vancouver:
Balmer AM. A search for active galactic nuclei neutrinos using the
MINOS detector. [Internet] [Masters thesis]. University of Minnesota; 2011. [cited 2021 Feb 28].
Available from: http://purl.umn.edu/104134.
Council of Science Editors:
Balmer AM. A search for active galactic nuclei neutrinos using the
MINOS detector. [Masters Thesis]. University of Minnesota; 2011. Available from: http://purl.umn.edu/104134
2.
LeSher, Daniel.
Analytic models of regularly branched polymer brushes using the self-consistent mean field theory.
Degree: 2015, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=1587909
► Polymer brushes consist of multiple monomers connected together with one of the polymer chain's ends attached to a surface. Polymer brushes have shown great…
(more)
▼ Polymer brushes consist of multiple monomers connected together with one of the polymer chain's ends attached to a surface. Polymer brushes have shown great promise for a wide variety of applications including drug delivery dendrimer systems and as tunable brushes that can change their shape and physical properties in response to changes in their environment. Regularly branched polymer brushes which are structured as a function of their chemical indices are investigated here using the self-consistent mean field theory for electrically neutral polymers. The brushes were described using weighting functions, <i> f(n)</i>, were <i>n</i> was the fewest number of monomers from a specified location to a free end. Brushes with weighting functions of the form <i>f(n)=nb, f(n)=ebn</i>, as well as <i>f(n)=dan</i> when <i>d</i> 2 and α > 2 were found to match the parabolic free chain end profile expected, while it was determined that polymer brushes described using <i>f(n)=n b</i> must be very small in order to remain in equilibrium. However, brushes described by <i>f(n)</i>=2<i>G(N-n) N</i> and <i>f(n)</i>2<i>n</i> were found to be unstable for real, positive values of the potential of the system.
Subjects/Keywords: Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
LeSher, D. (2015). Analytic models of regularly branched polymer brushes using the self-consistent mean field theory. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=1587909
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
LeSher, Daniel. “Analytic models of regularly branched polymer brushes using the self-consistent mean field theory.” 2015. Thesis, California State University, Long Beach. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=1587909.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
LeSher, Daniel. “Analytic models of regularly branched polymer brushes using the self-consistent mean field theory.” 2015. Web. 28 Feb 2021.
Vancouver:
LeSher D. Analytic models of regularly branched polymer brushes using the self-consistent mean field theory. [Internet] [Thesis]. California State University, Long Beach; 2015. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1587909.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
LeSher D. Analytic models of regularly branched polymer brushes using the self-consistent mean field theory. [Thesis]. California State University, Long Beach; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=1587909
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Rice University
3.
Chen, Yi.
Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere.
Degree: PhD, Natural Sciences, 2011, Rice University
URL: http://hdl.handle.net/1911/64402
► Theoretical studies have pointed out that in the inner part of a rapidly rotating magnetosphere such as that of Jupiter and Saturn, the dominant driving…
(more)
▼ Theoretical studies have pointed out that in the inner part of a rapidly rotating
magnetosphere such as that of Jupiter and Saturn, the dominant driving factor of
radial plasma transport is the centrifugal interchange instability. After the in-situ
observations of the Cassini spacecraft became available, the major observable
signature of radial plasma convection is reported as a series of longitudinally
localized injections and simultaneous drift dispersions of hot tenuous plasma from the
outer magnetosphere. The Cassini Plasma Spectrometer (CAPS) and the Cassini
Magnetospheric Imaging Instrument (MIMI) have observed signatures of these
processes frequently, providing direct evidence for Saturn's magnetospheric
centrifugally driven convective motions, in which the radial transport of plasma
comprises hot, tenuous plasma moving inward and cooler, denser plasma moving
outward.
With methods similar to those of Hill et al. [2005], we study the statistics of the
properties of such events by analyzing CAPS data from 26 Cassini orbits. A statistical
picture of their major characteristics is developed, including the distributions of ages,
longitudinal widths, radial distances, and longitudes and local times, which are all
consistent with previous results. An unexpected longitude modulation of these events
appears in the old (SLS) longitude system, while no such modulation seems to exist
in the new (SLS2/SLS3) longitude system. A Lomb periodogram analysis, however,
reveals no significant periodic modulation of these events.
We further extend the statistical sample of these injection/dispersion events and find
that the inflow channels occupy only a small fraction (~ 7%) of the total available
longitudinal space, indicating that the inflow sectors are much narrower than the
outflow sectors. Furthermore, we assume that the plasma is largely confined to a thin
equatorial sheet, and calculate its thickness by deriving the centrifugal scale height
profile based on the CAPS observations. We also present the radial and longitudinal
dependences of flux tube mass content, as well as the total ion mass between 5 and 10
Saturn radii. Combining these results, we estimate a global plasma mass outflow rate
~ 280 kg/so
Advisors/Committee Members: Hill, Thomas W. (advisor).
Subjects/Keywords: Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Y. (2011). Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/64402
Chicago Manual of Style (16th Edition):
Chen, Yi. “Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere.” 2011. Doctoral Dissertation, Rice University. Accessed February 28, 2021.
http://hdl.handle.net/1911/64402.
MLA Handbook (7th Edition):
Chen, Yi. “Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere.” 2011. Web. 28 Feb 2021.
Vancouver:
Chen Y. Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere. [Internet] [Doctoral dissertation]. Rice University; 2011. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1911/64402.
Council of Science Editors:
Chen Y. Centrifugally Driven Radial Convection of Plasma
in Saturn's Inner Magnetosphere. [Doctoral Dissertation]. Rice University; 2011. Available from: http://hdl.handle.net/1911/64402
Rice University
4.
Dai, Yanhua.
Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems.
Degree: PhD, Natural Sciences, 2011, Rice University
URL: http://hdl.handle.net/1911/64414
► Two-dimensional electron gas (2DEG) in microwave irradiation has been an intriguing system to study transport properties of electrons for a decade, during which extensive important…
(more)
▼ Two-dimensional electron gas (2DEG) in microwave irradiation has been an intriguing
system to study transport properties of electrons for a decade, during which
extensive important phenomena have been discovered, such as microwave induced resistance
oscillation (MIRO), zero resistance state(ZRS) and zero conductance state(ZCS).
Along this direction, this thesis is devoted to new phenomena recently discovered in
such systems, 1) microwave induced cyclotron harmonic peak (2wc spike) in ultraclean
2DEG without antidots inducing electric modulation potential 2) Aharonov-
Bohm(AB) oscillations in microwave irradiated 2DEG with modulation potential.
Those phenomena originate from quantum interference, from either interplay between
two different kinds of scattering or different electrons transition paths.
In addition to microwave induced phenomena, other nonlinear effects such as Zener
tunneling and geometric resonance(GR) have been investigated further in the past few
years and collected in this thesis. Zener tunneling has been found in two-dimensional
hole gas(2DHG) with a large damping factor, which inspires more questions on the
unique band structures of holes. GR has been studied in ultra-clean modulated 2DEG
, in which more oscillation peaks show up. In the GR regime with an inplane magnetic
field applied, the antisymmetric hall oscillations lead us to propose the existence of a
magnetic lattice along with an artificial antidots lattice and a current lattice in such
systems.
Advisors/Committee Members: Du, Rui-Rui (advisor).
Subjects/Keywords: Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dai, Y. (2011). Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems. (Doctoral Dissertation). Rice University. Retrieved from http://hdl.handle.net/1911/64414
Chicago Manual of Style (16th Edition):
Dai, Yanhua. “Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems.” 2011. Doctoral Dissertation, Rice University. Accessed February 28, 2021.
http://hdl.handle.net/1911/64414.
MLA Handbook (7th Edition):
Dai, Yanhua. “Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems.” 2011. Web. 28 Feb 2021.
Vancouver:
Dai Y. Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems. [Internet] [Doctoral dissertation]. Rice University; 2011. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1911/64414.
Council of Science Editors:
Dai Y. Quantum Transport and Microwave Response in
Modulated High-Mobility Two-Dimensional Electron
Systems. [Doctoral Dissertation]. Rice University; 2011. Available from: http://hdl.handle.net/1911/64414
5.
Asbell, Jessica Lee.
Non-radial fluid pulsation modes of compact stars.
Degree: 2016, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10150591
► The observation of gravitational waves from compact stars (neutron and quark stars) is a promising method of determining their internal composition. This research presents…
(more)
▼ The observation of gravitational waves from compact stars (neutron and quark stars) is a promising method of determining their internal composition. This research presents the details and results for calculations of some of the principal modes of compact star oscillations, by which they radiate gravitational waves. These are: the <i>f</i>-modes, <i>p</i>-modes, and <i>g</i>-modes. We find that for the same stellar mass, the <i> f</i>-modes for quark stars are higher in frequency than for neutron stars. The <i>p</i>-mode frequency of quark stars decrease with stellar mass, displaying an opposite trend to that of neutron stars. Two-component models were also considered. A core-ocean model was examined for a neutron star, using a polytropic equation of state (EOS), and a core-crust model for a quark star, using a bag model EOS. We find that <i>g</i>-mode oscillations in neutron star oceans depend on the dominant chemical species of the ocean as well as the mass of the underlying core. The addition of a solid crust onto a quark star increases the frequencies, attributable to shear stresses between the core and crust. These results pave the way to model and contrast the gravitational wave signals emitted by oscillating compact stars.
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Asbell, J. L. (2016). Non-radial fluid pulsation modes of compact stars. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10150591
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Asbell, Jessica Lee. “Non-radial fluid pulsation modes of compact stars.” 2016. Thesis, California State University, Long Beach. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10150591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Asbell, Jessica Lee. “Non-radial fluid pulsation modes of compact stars.” 2016. Web. 28 Feb 2021.
Vancouver:
Asbell JL. Non-radial fluid pulsation modes of compact stars. [Internet] [Thesis]. California State University, Long Beach; 2016. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10150591.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Asbell JL. Non-radial fluid pulsation modes of compact stars. [Thesis]. California State University, Long Beach; 2016. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10150591
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Yale University
6.
Jiang, Fangzhou.
Characterizing the Substructure of Dark Matter Halos.
Degree: 2017, Yale University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10584949
► Hierarchical structure formation in the standard Λ+cold dark matter (CDM) model produces gravitationally bound clumpy halos with abundant substructure. These subhalos are the remnants…
(more)
▼ Hierarchical structure formation in the standard Λ+cold dark matter (CDM) model produces gravitationally bound clumpy halos with abundant substructure. These subhalos are the remnants of dark matter halos that have been accreted by their host halo over cosmic time, and have survived tidal destruction. Understanding halo substructure is extremely important, as subhalos are believed to host satellite galaxies, boost the dark matter annihilation signal, cause tidal heating of fragile structures such as stellar streams and disks, and are potentially responsible for interesting phenomena in gravitational lensing. Most importantly, the demographics of subhalos contain information of the Universe, thus providing a stringent testbed for the cosmological model. This thesis provides a comprehensive study of dark matter subhalos, using a combination of cosmological <i>N</i>-body simulations and semi-analytic modeling. We start with developing a new, semi-analytic model describing halo assembly and subhalo evolution. The model combines Monte-Carlo techniques of generating halo merging histories and simple analytical descriptions for the evolution of subhalos, thus offering extremely fast computation, the agility to experiment with different cosmologies, and the control of specific physical processes. The model accurately predicts the distributions of subhalo mass and structural parameters in cosmological simulations, and outperforms simulations in terms of mass resolution and statistical power. Taking advantage of the speed and agility of the model, we present universal fitting formulae for subhalo mass and maximum circular velocity (<sup>&ngr;</sup>max) functions that are valid for a broad range in host halo mass, redshift and CDM cosmology. The remainder of the dissertation makes use of the model, together with a number of state-of-the-art <i>N</i>-body simulations, to study the statistics of halo substructure. Recent high-resolution CDM simulations reveal ~10 massive Galactic subhalos whose central potential wells are too deep to be consistent with those of the ~10 brightest Milky-Way (MW) satellite galaxies. This inconsistency, dubbed the `too-big-to-fail' problem (TBTF), has become a persistent challenge to the standard ACDM cosmology. However, the number of well resolved Galactic halos in simulations is too small to fully capture the halo-to-halo variance in substructure content, which hinders the interpretation of the inconsistency. Unleashing the power of the semi-analytic model, we generate thousands of MW-size halos with well-resolved subhalo populations, and explicitly demonstrate that a reliable assessment of TBTF requires such large samples. We argue that existing statistics used to address TBTF suffer from the look-elsewhere effect and/or disregard certain aspects of the data on the MW satellite population. We devise a new statistic that is not hampered by these shortcomings, and, using data of the MW satellites with vmax > 15 km s-1, demonstrate that 1.4+3.3-1.1%…
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Jiang, F. (2017). Characterizing the Substructure of Dark Matter Halos. (Thesis). Yale University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10584949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jiang, Fangzhou. “Characterizing the Substructure of Dark Matter Halos.” 2017. Thesis, Yale University. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10584949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jiang, Fangzhou. “Characterizing the Substructure of Dark Matter Halos.” 2017. Web. 28 Feb 2021.
Vancouver:
Jiang F. Characterizing the Substructure of Dark Matter Halos. [Internet] [Thesis]. Yale University; 2017. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10584949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jiang F. Characterizing the Substructure of Dark Matter Halos. [Thesis]. Yale University; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10584949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California, Berkeley
7.
Duncan, Nicole.
Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument.
Degree: 2018, University of California, Berkeley
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10620536
► Solar flares can release ~1e33 ergs of power, accelerate particles to relativistic speeds, heat plasma to ~15 million K and catastrophically reorganize 1e5 km…
(more)
▼ Solar flares can release ~1e33 ergs of power, accelerate particles to relativistic speeds, heat plasma to ~15 million K and catastrophically reorganize 1e5 km long field structures in 100s–1000s of seconds. Magnetic reconnection of large-scale field structures in the corona are thought to power flares, but the precise mechanisms that convert the stored magnetic energy into particle kinetic energy are poorly understood. Flare spectra in the 20 keV–10 MeV energy range are rich with information that provide a window into the underlying physics of flare particle acceleration. This hard X-ray (HXR)/gamma-ray emission can be used to understand electron and ion dynamics, particle abundances and the ambient plasma conditions in solar flares. Enhanced imaging, spectroscopy and polarimetry of flare emissions in this energy range are needed to address the current era of particle acceleration and transport questions, including: What causes the spatial separation between HXR emission generated by relativistic electrons and the gamma-ray line emission from energetic ions? How anisotropic are the relativistic electrons, and why can they dominate in the corona? How do the compositions of accelerated and ambient material vary with space and time, and why? The <i>Reuven Ramaty High Energy Solar Spectroscopic Imager</i> (RHESSI) instrument, launched in 2002, provided the first combined imaging and high-resolution spectroscopy in the HXR/gamma-ray range. RHESSI's volumes of detailed study on electron-associated emission < 1 MeV is in contrast to comparatively few ion-associated gamma-ray observations. Over the past two solar cycles RHESSI has imaged only five flares at the 2.2 MeV neutron-capture line and has been able to resolve ion lines in ~30 events. My research aims to expand this small set gamma-ray flare observations by (1) using new techniques to study flares obscured by high-background counts in the existing RHESSI dataset and (2) providing new observations through the development and flight of the <i>Gamma-Ray Imager/Polarimeter for Solar Flares</i> (GRIPS) instrument.
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Duncan, N. (2018). Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument. (Thesis). University of California, Berkeley. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10620536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Duncan, Nicole. “Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument.” 2018. Thesis, University of California, Berkeley. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10620536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Duncan, Nicole. “Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument.” 2018. Web. 28 Feb 2021.
Vancouver:
Duncan N. Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument. [Internet] [Thesis]. University of California, Berkeley; 2018. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10620536.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Duncan N. Gamma-Ray Observations of Solar Flares with RHESSI Imaging Spectroscopy and the GRIPS instrument. [Thesis]. University of California, Berkeley; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10620536
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California – Irvine
8.
Graus, Andrew Steven.
Exploring fundamental physics with small-scale structures.
Degree: Physics, 2018, University of California – Irvine
URL: http://www.escholarship.org/uc/item/3kc5v96z
► One of the goals of theoretical galaxy formation is to use simulations combined with observations in order to constrain the fundamental physics that govern the…
(more)
▼ One of the goals of theoretical galaxy formation is to use simulations combined with observations in order to constrain the fundamental physics that govern the formation of galaxies. Of particular interest are physical processes that can impact the formation of small-scale structures. Among the things we can potentially constrain with a combination of observations and simulations of small-scale structures are stellar feedback, reionization, and dark matter particle physics. We investigate several promising avenues to constrain fundamental physics with simulations of galaxy formation. First, we use the star formation histories (SFH) for Local Group dwarf galaxies in order to constrain high-redshift stellar mass functions (SMFs). Second, we look at the destruction of substructure around large galaxies, and how it may impact the detection of substructure via subhalo lensing. Finally, we use full hydrodynamics simulations of Local Volume dwarf galaxies in order to investigate the impact of stellar feedback on the age distributions of stars within these galaxies.
Subjects/Keywords: Astrophysics; Astronomy; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Graus, A. S. (2018). Exploring fundamental physics with small-scale structures. (Thesis). University of California – Irvine. Retrieved from http://www.escholarship.org/uc/item/3kc5v96z
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Graus, Andrew Steven. “Exploring fundamental physics with small-scale structures.” 2018. Thesis, University of California – Irvine. Accessed February 28, 2021.
http://www.escholarship.org/uc/item/3kc5v96z.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Graus, Andrew Steven. “Exploring fundamental physics with small-scale structures.” 2018. Web. 28 Feb 2021.
Vancouver:
Graus AS. Exploring fundamental physics with small-scale structures. [Internet] [Thesis]. University of California – Irvine; 2018. [cited 2021 Feb 28].
Available from: http://www.escholarship.org/uc/item/3kc5v96z.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Graus AS. Exploring fundamental physics with small-scale structures. [Thesis]. University of California – Irvine; 2018. Available from: http://www.escholarship.org/uc/item/3kc5v96z
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
9.
Hahn, ChangHoon.
Galaxies and Their Host Dark Matter Structures.
Degree: 2017, New York University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10261676
► Through their connection with dark matter structures, galaxies act as tracers of the underlying matter distribution in the Universe. Their observed spatial distribution allows…
(more)
▼ Through their connection with dark matter structures, galaxies act as tracers of the underlying matter distribution in the Universe. Their observed spatial distribution allows us to precisely measure large scale structure and effectively test cosmological models that explain the content, geometry, and history of the Universe. Current observations from galaxy surveys such as the Baryon Oscillation Spectroscopic Survey have already probed vast cosmic volumes with millions of galaxies and ushered in an era of precision cosmology. The next surveys will probe over an order of magnitude more. With this unprecedented statistical power, the bottleneck of scientific discovery is in the methodology. In this dissertation, I address major methodological challenges in constraining cosmology with the large-scale distribution of galaxies. I develop a robust framework for treating systematic effects, which significantly bias galaxy clustering measurements. I apply new innovative approaches to probabilistic parameter inference that challenge and test the in- correct assumptions of the standard approach. Furthermore, I use precise predictions of structure formation from cosmology and observations of galaxies during the last eight billion years to develop detailed models of how galaxies are impacted by their host dark matter structures. These models provide key insight into the galaxy-halo connection, which bridges the gap between cosmology theory and observations. They also answer crucial questions of how galaxies form and evolve. The developments in this dissertation will help unlock the full potential of future observations and allow us to precisely test cosmological models, General Relativity and modified gravity scenarios, and even particle physics theory beyond the Standard Model.
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hahn, C. (2017). Galaxies and Their Host Dark Matter Structures. (Thesis). New York University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10261676
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hahn, ChangHoon. “Galaxies and Their Host Dark Matter Structures.” 2017. Thesis, New York University. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10261676.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hahn, ChangHoon. “Galaxies and Their Host Dark Matter Structures.” 2017. Web. 28 Feb 2021.
Vancouver:
Hahn C. Galaxies and Their Host Dark Matter Structures. [Internet] [Thesis]. New York University; 2017. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10261676.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hahn C. Galaxies and Their Host Dark Matter Structures. [Thesis]. New York University; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10261676
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Washington State University
10.
Deaton, Michael Brett.
Neutrinos in mergers of neutron stars with black holes.
Degree: 2015, Washington State University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=3732682
► Mergers of a neutron star and a black hole are interesting because of the dual complexity of the black hole's strong gravity and the…
(more)
▼ Mergers of a neutron star and a black hole are interesting because of the dual complexity of the black hole's strong gravity and the neutron star's nuclear-density fluid. Mergers can yield short-lived nuclear accretion disks, emitting copious neutrinos. This radiation may change the thermodynamic state of the disk itself, may drive an ultrarelativistic jet of electrons and positrons, may oscillate in its flavor content, may irradiate surrounding matter, playing a role in nucleosynthesis, and may be detected directly. In this thesis I present a model of such a merger, its remnant accretion disk, and its neutrino emission. In particular, we evolve a neutron star—black hole merger through ∼100 ms, solving the full general relativistic hydrodynamics equations, from inspiral through merger and accretion epochs. We treat the neutrinos approximately, using a leakage framework, which accounts for local energy losses and composition drift in the fluid due to escaping neutrinos. We use geodesic ray tracing on a late time slice of the model to calculate the full spatial-, angular-, and energy-dependence of the neutrino distribution function around the accretion disk. This distribution then serves in a computation of the energy available to form a jet via neutrino-antineutrino annihilation in the disk funnel. In this scenario, we find that enough energy is deposited to drive a jet of short-gamma-ray-burst-energy by neutrino processes alone.
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Deaton, M. B. (2015). Neutrinos in mergers of neutron stars with black holes. (Thesis). Washington State University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=3732682
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Deaton, Michael Brett. “Neutrinos in mergers of neutron stars with black holes.” 2015. Thesis, Washington State University. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=3732682.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Deaton, Michael Brett. “Neutrinos in mergers of neutron stars with black holes.” 2015. Web. 28 Feb 2021.
Vancouver:
Deaton MB. Neutrinos in mergers of neutron stars with black holes. [Internet] [Thesis]. Washington State University; 2015. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3732682.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Deaton MB. Neutrinos in mergers of neutron stars with black holes. [Thesis]. Washington State University; 2015. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=3732682
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of California, Santa Cruz
11.
Hollowood, Devon.
Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations.
Degree: 2019, University of California, Santa Cruz
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10973254
► The formation history of galaxy clusters is a powerful probe of cosmology. In particular, one may place strong constraints on the dark energy equation…
(more)
▼ The formation history of galaxy clusters is a powerful probe of cosmology. In particular, one may place strong constraints on the dark energy equation of state by examining the evolution across redshift of the number density of galaxy clusters as a function of mass. In this thesis, I describe my contributions to cluster cosmology, in particular to the development of the richness optical observable mass proxy. I introduce <i>redMaPPer</i>, an optical cluster finder which represents an important upstream input for my thesis work. I next introduce the <b>M</b>ass <b>A</b>nalysis <b>T</b>ool for <b>Cha </b>ndra (<i><b>MATCha</b></i>), a pipeline which uses a parallelized algorithm to analyze archival Chandra data. <i>MATCha</i> simultaneously calculates X-ray temperatures and luminosities and performs centering measurements for hundreds of potential galaxy clusters using archival X-ray exposures. I run <i>MATCha</i> on the <i>redMaPPer</i> SDSS DR8 cluster catalog and use <i>MATCha</i>'s output X-ray temperatures and luminosities to analyze the galaxy cluster temperature-richness, luminosity-richness, luminosity-temperature, and temperature-luminosity scaling relations. I investigate the distribution of offsets between the X-ray center and <i>redMaPPer</i> center within 0.1 < <i>z</i> < 0.35 and explore some of the causes of <i>redMaPPer</i> miscentering. I collaborate with members of the Dark Energy Survey in order to repeat this analysis on Dark Energy Survey Year 1 data. I outline the various ways in which <i>MATCha </i> constitutes an important upstream work for a variety of astrophysical applications. These include the calibrations of two separate mass proxies, the study of the AGN fraction of galaxy clusters, and cosmology from cluster number densities and stacked weak lensing masses. Finally, I outline future upgrades and applications for <i>MATCha</i> throughout the lifespan of the Dark Energy Survey and the Large Synoptic Survey Telescope.
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hollowood, D. (2019). Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations. (Thesis). University of California, Santa Cruz. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10973254
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Hollowood, Devon. “Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations.” 2019. Thesis, University of California, Santa Cruz. Accessed February 28, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10973254.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hollowood, Devon. “Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations.” 2019. Web. 28 Feb 2021.
Vancouver:
Hollowood D. Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations. [Internet] [Thesis]. University of California, Santa Cruz; 2019. [cited 2021 Feb 28].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10973254.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hollowood D. Cosmological Studies through Large-Scale Distributed Analysis of Chandra Observations. [Thesis]. University of California, Santa Cruz; 2019. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10973254
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Florida State University
12.
Dragulin, Paul.
Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment.
Degree: PhD, Physics, 2015, Florida State University
URL: http://purl.flvc.org/fsu/fd/FSU_2015fall_Dragulin_fsu_0071E_12745
;
► The identities of the progenitors of type Ia supernova (SN Ia) has long been under study and remains an unsolved problem of astrophysics. The answer…
(more)
▼ The identities of the progenitors of type Ia supernova (SN Ia) has long been under study and remains an unsolved problem of astrophysics. The answer to this question will impact
cosmology and subfields such as galactic evolution. To help resolve this issue and determine what systems give rise to SN Ia, the relationships between progenitor systems, their winds, and
their environments are here considered, and a theoretical tool is created to model the consequences. I present theoretical semi-analytic models for the interaction of stellar winds with
the interstellar medium (ISM). To investigate a wide range of possible winds and environments, I developed and employ piecewise, semi-analytical descriptions implemented in the code SPICE
(Supernovae Progenitor Interaction Calculator for parameterized Environments, available on request), assuming spherical symmetry and power-law ambient density profiles. It is shown that a
wide class of solutions can be found using the Buckingham Π-theorem. Semi-analytic solutions allow us to test a wide variety of configurations, their dependencies on the wind and
environment parameters, and find non-unique solutions within a set of observational constraints. SPICE may be used to model such interactions in different types of Supernovae (SNe),
stellar winds, as well as modeling realistic feedback in star formation and large scale galactic evolution simulations. As one of the many potential applications for SPICE, here I study
pre-conditioning of the environment of Type Ia Supernovae (SNe Ia), which may originate from two merging WDs, known as the double degenerate scenario (DD), or an accreting white dwarf star
(WD) from a non-degenerate companion, known as the single degenerate scenario (SD). The wind of the progenitor systems may originate from the progenitor, a donor star, or an accretion
disk (AD). The environment is determined by the ISM and/or the wind of the donor star or the wind of the progenitor star during a prior epoch. The free parameters are: the a) mass loss [m with dot above]
, b) wind velocity v[subscript w], c) density distributions ∝ r[superscript -s] of the ISM, and d)} the duration of the wind prior to the supernova explosion. I discuss the observational
signatures with respect to light curves and high resolution spectra as tools to probe the environment of SNe Ia. The specific properties and evolution of the progenitor systems are found
to leave unique imprints. During the progenitor evolution and with typical parameters in the SD scenario, the winds create a low density bubble surrounding the progenitor system and a
high-density shell. It is also found that accretion disk winds dominate the environment formation. Within a distance of several light-years (ly), the densities are smaller by factors of
10²…⁴ compared to the environment. This explains the general lack of observed interaction in…
Advisors/Committee Members: Peter Höflich (professor directing dissertation), Wei Yang (university representative), Kevin Huffenberger (committee member), Winston Roberts (committee member), Joseph F. Owens (committee member).
Subjects/Keywords: Astrophysics; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dragulin, P. (2015). Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment. (Doctoral Dissertation). Florida State University. Retrieved from http://purl.flvc.org/fsu/fd/FSU_2015fall_Dragulin_fsu_0071E_12745 ;
Chicago Manual of Style (16th Edition):
Dragulin, Paul. “Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment.” 2015. Doctoral Dissertation, Florida State University. Accessed February 28, 2021.
http://purl.flvc.org/fsu/fd/FSU_2015fall_Dragulin_fsu_0071E_12745 ;.
MLA Handbook (7th Edition):
Dragulin, Paul. “Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment.” 2015. Web. 28 Feb 2021.
Vancouver:
Dragulin P. Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment. [Internet] [Doctoral dissertation]. Florida State University; 2015. [cited 2021 Feb 28].
Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Dragulin_fsu_0071E_12745 ;.
Council of Science Editors:
Dragulin P. Exploration of the Interaction of Type Ia Supernovae with the Circumstellar Environment. [Doctoral Dissertation]. Florida State University; 2015. Available from: http://purl.flvc.org/fsu/fd/FSU_2015fall_Dragulin_fsu_0071E_12745 ;
Columbia University
13.
Corrales, Lia Racquel.
High Energy Studies of Astrophysical Dust.
Degree: 2015, Columbia University
URL: https://doi.org/10.7916/D85T3J69
► Astrophysical dust – any condensed matter ranging from tens of atoms to micron sized grains – accounts for about one third of the heavy elements…
(more)
▼ Astrophysical dust – any condensed matter ranging from tens of atoms to micron sized grains – accounts for about one third of the heavy elements produced in stars and disseminated into space. These tiny pollutants are responsible for producing the mottled appearance in the spray of light we call the "Milky Way." However these seemingly inert particles play a strong role in the physics of the interstellar medium, aiding star and planet formation, and perhaps helping to guide galaxy evolution. Most dust grains are transparent to X-ray light, leaving a signature of atomic absorption, but also scattering the light over small angles. Bright X-ray objects serendipitously situated behind large columns of dust and gas provide a unique opportunity to study the dust along the line of sight. I focus primarily on X-ray scattering through dust, which produces a diffuse halo image around a central point source. Such objects have been observed around X-ray bright Galactic binaries and extragalactic objects that happen to shine through the plane of the Milky Way. I use the Chandra X-ray Observatory, a space-based laboratory operated by NASA, which has imaging resolution ideal for studying X-ray scattering halos. I examine several bright X-ray objects with dust-free sight lines to test their viability as templates and develop a parametric model for the Chandra HETG point spread function (PSF).
Subjects/Keywords: Astrophysics; Astronomy; Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Corrales, L. R. (2015). High Energy Studies of Astrophysical Dust. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D85T3J69
Chicago Manual of Style (16th Edition):
Corrales, Lia Racquel. “High Energy Studies of Astrophysical Dust.” 2015. Doctoral Dissertation, Columbia University. Accessed February 28, 2021.
https://doi.org/10.7916/D85T3J69.
MLA Handbook (7th Edition):
Corrales, Lia Racquel. “High Energy Studies of Astrophysical Dust.” 2015. Web. 28 Feb 2021.
Vancouver:
Corrales LR. High Energy Studies of Astrophysical Dust. [Internet] [Doctoral dissertation]. Columbia University; 2015. [cited 2021 Feb 28].
Available from: https://doi.org/10.7916/D85T3J69.
Council of Science Editors:
Corrales LR. High Energy Studies of Astrophysical Dust. [Doctoral Dissertation]. Columbia University; 2015. Available from: https://doi.org/10.7916/D85T3J69
Queen Mary, University of London
14.
Bolmatov, Dmitry.
Thermodynamic, dynamic and structural properties of liquid and supercritical matter.
Degree: PhD, 2013, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8371
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664938
► Among three basic states of matter (solid, liquid, gas), liquids are least understood from the theoretical point of view. The perceived diffculty is that interactions…
(more)
▼ Among three basic states of matter (solid, liquid, gas), liquids are least understood from the theoretical point of view. The perceived diffculty is that interactions in a liquid are both strong and system-specific, implying that the energy strongly depends on the liquid type and that, therefore, liquid energy can not be calculated in general form. In this thesis, a phonon theory of liquids is developed where this problem is avoided. Central to the thesis is a development an alternative to calculating liquid energy and heat capacity. The proposed phonon theory of liquids covers both classical and quantum regimes and accounts for the contribution of anharmonicity and thermal expansion to liquid energy and heat capacity. Within the framework of the phonon theory of liquids a good agreement of calculated and experimental heat capacity of liquids, including helium, noble, metallic, molecular and hydrogen-bonded network liquids in a wide range of temperature and pressure is demonstrated. It was also found that in the very wide pressure range 5 MPa-500 MPa liquid helium near melting temperature is both solid-like and quantum. The thermodynamic properties of the supercritical state are studied, which lead to discovery that specific heat shows a crossover between two different dynamic regimes of the low-temperature rigid liquid and high-temperature non-rigid supercritical fluid. A theory of heat capacity above the crossover is formulated, and good agreement between calculated and experimental data for rare-gas supercritical liquids is obtained. The relationship between power exponents of heat capacity and viscosity in the supercritical region is derived. The thermodynamic properties are explained by the temperature behaviour of the maximal length of the longitudinal phonons that can exist in the supercritical system and that is not sensitive to system details. We also introduce a new idea that enables a unified description of all three states of matter. A generic form of an interacting phonon Hamiltonian with ground state configurations minimising the potential is introduced. Symmetry breaking leads to emergence of energy gaps of shear excitations as a consequence of the Goldstone theorem, and readily results in the emergence of energy spectra of solid, liquid and gas phases.
Subjects/Keywords: 530.4; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bolmatov, D. (2013). Thermodynamic, dynamic and structural properties of liquid and supercritical matter. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664938
Chicago Manual of Style (16th Edition):
Bolmatov, Dmitry. “Thermodynamic, dynamic and structural properties of liquid and supercritical matter.” 2013. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664938.
MLA Handbook (7th Edition):
Bolmatov, Dmitry. “Thermodynamic, dynamic and structural properties of liquid and supercritical matter.” 2013. Web. 28 Feb 2021.
Vancouver:
Bolmatov D. Thermodynamic, dynamic and structural properties of liquid and supercritical matter. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2013. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664938.
Council of Science Editors:
Bolmatov D. Thermodynamic, dynamic and structural properties of liquid and supercritical matter. [Doctoral Dissertation]. Queen Mary, University of London; 2013. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8371 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664938
Queen Mary, University of London
15.
Elliston, Joseph.
Observable predictions of generalised inflationary scenarios.
Degree: PhD, 2013, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8457
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667097
► Inflation is an early period of accelerated cosmic expansion, thought to be sourced by high energy physics. A key task today is to use the…
(more)
▼ Inflation is an early period of accelerated cosmic expansion, thought to be sourced by high energy physics. A key task today is to use the influx of increasingly precise observational data to constrain the plethora of inflationary models suggested by fundamental theories of interactions. This requires a robust theoretical framework for quantifying the predictions of such models; helping to develop such a framework is the aim of this thesis. We begin by providing the first complete quantization of subhorizon perturbations for the well-motivated class of multi-field inflationary models that possess a non-trivial field metric. In particular, the implications for the bispectrum of the Cosmic Microwave Background (cmb) are potentially very exciting. The subsequent evolution of perturbations in the superhorizon epoch is then considered, via a covariant extension of the transport formalism. We demonstrate appropriate matching between the subhorizon and superhorizon calculations. With the aim of developing intuition about the relation between inflationary dynamics and the evolution of cosmic observables, we investigate analytic approximations of superhorizon perturbation evolution. The validity of these analytic results is contingent on reaching a state of adiabaticity which we discuss and illustrate in depth. We then apply our analytic methods to elucidate the types of inflationary dynamics that lead to an enhanced cmb non-Gaussianity, both in its bispectrum and trispectrum. In addition to deriving a number of new simple relations between the non-Gaussianity parameters, we explain dynamically how and why different shapes of inflationary potential lead to particular observational signals. In addition to multiple scalar fields, candidate theories of high energy physics include many possible modifications to the Einstein{Hilbert action. We consider the observational viability of single field chaotic inflation with additional corrections as motivated by low energy effective string theory. These new ingredients allow for consistency of chaotic inflationary models that are otherwise in tension with observational data.
Subjects/Keywords: 523.1; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Elliston, J. (2013). Observable predictions of generalised inflationary scenarios. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8457 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667097
Chicago Manual of Style (16th Edition):
Elliston, Joseph. “Observable predictions of generalised inflationary scenarios.” 2013. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8457 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667097.
MLA Handbook (7th Edition):
Elliston, Joseph. “Observable predictions of generalised inflationary scenarios.” 2013. Web. 28 Feb 2021.
Vancouver:
Elliston J. Observable predictions of generalised inflationary scenarios. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2013. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8457 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667097.
Council of Science Editors:
Elliston J. Observable predictions of generalised inflationary scenarios. [Doctoral Dissertation]. Queen Mary, University of London; 2013. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8457 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667097
Queen Mary, University of London
16.
Fleuren, Simone.
The submillimetre and near-infrared properties of Herschel-ATLAS sources.
Degree: PhD, 2012, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8462
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667055
► In this thesis I investigate a sample of galaxies that are detected with the Herschel Space Telescope in the sub-millimetre wavelength range and that also…
(more)
▼ In this thesis I investigate a sample of galaxies that are detected with the Herschel Space Telescope in the sub-millimetre wavelength range and that also have near-infrared detections with the VISTA telescope in Chile as part of the VIKING survey. The first necessity is to find the near-infrared galaxies that are most likely to be the counterparts to the Herschel galaxies. I accomplish this by using a likelihood ratio method which I modify to allow for an appropriate estimate of the probability of finding a genuine near-infrared counterpart above the magnitude limit to a SPIRE source. This probability is found to be Q0 0.73. 51% of the SPIRE sources have a best VIKING counterpart with a reliability R = 0.8, and the false identification rate of these is estimated to be 4.2%. I expect to miss 5 per cent of true VIKING counterparts. There is evidence from Z - J and J - Ks colours that the reliable counterparts to SPIRE galaxies are marginally redder than the field population. I obtain photometric redshifts for 68% of all (non-stellar) VIKING candidates with a median redshift of ˜z = 0.405. I have spectroscopic redshifts for 3147 ( 28%) of the reliable counterparts from existing redshift surveys. Comparing to the results of the optical identifications supplied with the Phase I catalogue, I find that the use of medium-deep near-infrared data improves the identification rate of reliable counterparts from 36% to 51%. I investigate the evolution of the sub-millimetre luminosity function (LF) using the sample of SPIRE sources with reliable counterparts in VIKING with z 1. I find strong evolution of the 250 μm LF out to about redshift z = 0.6 and possibly out to z = 0.8 in broad agreement with previous studies. A double-power law seems to fit the local LF (z 0.2) slightly better than a Schechter function and we find a flatter slope at lower luminosities as compared to recent studies. i Finally, I construct the star formation rates (SFR) from far-infrared (FIR) and ultra-violet (UV) luminosities of the SPIRE sample with reliable VIKING counterparts (SFRFIR and SFRUV respectively) and show that the contribution of the SFRFIR increases with increasing luminosity. UV observations are hence crucial for all but the brightest SPIRE galaxies in calculating a total SFR. Calculating the slope of the UV continuum and comparing with the ratio LFIR/LUV leads to dust attenuation corrected SFRUV that represent the total SFR well in the low to medium LFIR range.
Subjects/Keywords: 523.01; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fleuren, S. (2012). The submillimetre and near-infrared properties of Herschel-ATLAS sources. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667055
Chicago Manual of Style (16th Edition):
Fleuren, Simone. “The submillimetre and near-infrared properties of Herschel-ATLAS sources.” 2012. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667055.
MLA Handbook (7th Edition):
Fleuren, Simone. “The submillimetre and near-infrared properties of Herschel-ATLAS sources.” 2012. Web. 28 Feb 2021.
Vancouver:
Fleuren S. The submillimetre and near-infrared properties of Herschel-ATLAS sources. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2012. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667055.
Council of Science Editors:
Fleuren S. The submillimetre and near-infrared properties of Herschel-ATLAS sources. [Doctoral Dissertation]. Queen Mary, University of London; 2012. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8462 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667055
Queen Mary, University of London
17.
Khademi, S.
The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors.
Degree: PhD, 2013, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8499
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667130
► Charge transport is the one the most fundamental concepts in organic semiconductors. The key quantity that characterises this transport behaviour is carrier mobility. The ability…
(more)
▼ Charge transport is the one the most fundamental concepts in organic semiconductors. The key quantity that characterises this transport behaviour is carrier mobility. The ability to transport carriers in a fast and unimpeded nature in organic devices such as Organic Photovoltaics (OPV) or Organic Light Emitting Diodes (OLED) is a key parameter for building more efficient devices. Significant steps have so far been taken to understand and model this phenomenon, however there are still many questions that need to be answered. One such fundamental question is the role of excited states on the charge transport properties of organic materials which historically has been ignored. This thesis aims to investigate the transport properties of two of the most widely used organic materials, N,N′-bis-[(1-naphthyl)-N,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine (NPB) and are N,N’-diphenyl-N,N’-bis 3-methylphenyl-1,1’-biphenyl-4,4’-diamine (TPD). We demonstrate how excitons are generated in a single organic layer OLED devices and how traditionally hole transport materials are capable of fast long range electron transport. We provide a comprehensive analysis of the charge transport properties of both materials with respect to the Gaussian Disorder Model (GDM) and demonstrate how both types of carriers can easily be transported in these materials. We then investigate the effects of exciton generation on the transport properties of the materials and propose some numerical modeling to analyse the effects of such excited states and the distribution of energetic traps in our system. We show that the swing of carrier mobility in either direction depends on the interplay and dominance of each mechanism (triplet/carrier interaction and trap filling). We also investigate the effects of 5 removing excited states from our device by deliberately introducing impurities via doping of a phosphorescent molecule to alter their concentration. Finally we propose some future direction that one can take to model charge transport behaviour in disordered organics based on the experimental work discussed in thesis.
Subjects/Keywords: 537.6; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Khademi, S. (2013). The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8499 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667130
Chicago Manual of Style (16th Edition):
Khademi, S. “The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors.” 2013. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8499 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667130.
MLA Handbook (7th Edition):
Khademi, S. “The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors.” 2013. Web. 28 Feb 2021.
Vancouver:
Khademi S. The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2013. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8499 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667130.
Council of Science Editors:
Khademi S. The effects of excited states and energetic traps on charge transport in disordered organic small molecule semiconductors. [Doctoral Dissertation]. Queen Mary, University of London; 2013. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8499 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667130
Queen Mary, University of London
18.
Little, William Robert.
Structure of, and light emission in, matrix-free Germanium quantum dots.
Degree: PhD, 2014, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8954
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667329
► The connection between light emission and structure of Germanium nanoparticles (3-10 nm) prepared by top-down (etching) and bottom-up (sol-gel and colloidal synthesis) has been investigated…
(more)
▼ The connection between light emission and structure of Germanium nanoparticles (3-10 nm) prepared by top-down (etching) and bottom-up (sol-gel and colloidal synthesis) has been investigated using Raman spectroscopy, TEM, x-ray absorption spectroscopy (XAS), x-ray di raction (XRD), and photoluminescence (PL). It was found that TEM, Raman spectroscopy, PL, and XRD techniques all result in di ering values for the nanoparticle size which don't all agree in the limit of experimental error. Several structural models have been proposed and tested by high pressure Raman measurements. It was found that a Raman peak corresponding to diamond-type Ge structure is observed well above the transition pressure of both amorphous ( six GPa) and crystalline ( 11 GPa) Ge. The pressure dependence of the Raman signal peak position was observed to follow an unexpected non-linear shift with a corresponding increase in peak width (FWHM). Possible structural origins of these trends have been investigated by adapting the widely used phonon con nement model to high pressure conditions and comparing experimental data with the model behaviour under assumptions of constant, and size-dependent bulk modulus. Considered collectively with the ambient structural data, the results of the analysis of the high pressure behaviour point to the phenomenon of gradual surface induced amorphisation under pressure in matrix-free Ge nanoparticles. The best structural model to describe this is a core-shell with the small crystalline core and a disordered surface layer. The local structure of samples was investigated using XAS, while opticallydetected XAS, using x-ray excited optical luminescence (XEOL), was used to link structure with optical emission. The emission was found to depend on surface termination; in oxygen terminated nanoparticles the oxide rich regions are responsi- 4 ble for light emission, while in their hydrogen terminated counterparts' pure Ge regions contribute to the luminescence. Furthermore, with the aid of molecular dynamics simulations it was shown that in hydrogen-terminated samples, optical emission is due to a topologically disordered (amorphous) region close to the surface of the nanoparticles. We demonstrated that OD-XAS can potentially provide subnanoparticle resolution due to its sensitivity to the light emitting sites in a sample. We further investigated the microscopic origins of such sensitivity and identi ed possible limitations. This work clearly demonstrates that a combination of methods sensitive to short-range and long-range structure are required for comprehensive characterisation of nanoscale systems.
Subjects/Keywords: 535; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Little, W. R. (2014). Structure of, and light emission in, matrix-free Germanium quantum dots. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8954 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667329
Chicago Manual of Style (16th Edition):
Little, William Robert. “Structure of, and light emission in, matrix-free Germanium quantum dots.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8954 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667329.
MLA Handbook (7th Edition):
Little, William Robert. “Structure of, and light emission in, matrix-free Germanium quantum dots.” 2014. Web. 28 Feb 2021.
Vancouver:
Little WR. Structure of, and light emission in, matrix-free Germanium quantum dots. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8954 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667329.
Council of Science Editors:
Little WR. Structure of, and light emission in, matrix-free Germanium quantum dots. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8954 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667329
Queen Mary, University of London
19.
Macey, Tom.
An algorithm to measure parton fragmentation at large hadron colliders.
Degree: PhD, 2014, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8657
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667262
► The Standard Model of particle physics is discussed with emphasis on light quark QCD, and existing data on light quark fragmentation from e+e annihilation and…
(more)
▼ The Standard Model of particle physics is discussed with emphasis on light quark QCD, and existing data on light quark fragmentation from e+e annihilation and deep inelastic scattering experiments. A method is developed to measure the directionally correlated pionic scaled momentum distribution, or partonic fragmentation function, in large hadron collider conditions. Jet algorithms are used to provide partonic momentum estimates, which in turn scale the hadronic momenta. The associated resolution is unfolded. Hadronic profiles about the parton are examined at Monte Carlo "truth" level. There is found to be a uniform uncorrelated background, which may be estimated event-by-event in regions away from jets and then subtracted statistically from the final distributions. A variable radius cone sampling method is used to count correlated charged hadrons and this also provides a method of coping with any poor directional resolution of jet algorithms. Extrapolation techniques make an estimated measurement possible when the largest safe sampling radius is not large enough to include all correlated hadrons. A novel method to calculate jet mass using jet collimation information available from the FAPS method is demonstrated. The algorithm was tested over an order of magnitude in hard scale ( 100GeV ! 1TeV) with two standard ATLAS reconstructed level Monte Carlos, Pythia and HERWIG, and the calculated fragmentation function is found to be in agreement with the trend of previous data at the hard scale overlap. These models have very different hadronisation models, so may be used to estimate systematic error and test feasibility for a possible full large scale measurement in data. Such work could support the concept of quark universality by establishing propagator invariance.
Subjects/Keywords: 539.7; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Macey, T. (2014). An algorithm to measure parton fragmentation at large hadron colliders. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8657 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667262
Chicago Manual of Style (16th Edition):
Macey, Tom. “An algorithm to measure parton fragmentation at large hadron colliders.” 2014. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8657 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667262.
MLA Handbook (7th Edition):
Macey, Tom. “An algorithm to measure parton fragmentation at large hadron colliders.” 2014. Web. 28 Feb 2021.
Vancouver:
Macey T. An algorithm to measure parton fragmentation at large hadron colliders. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2014. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8657 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667262.
Council of Science Editors:
Macey T. An algorithm to measure parton fragmentation at large hadron colliders. [Doctoral Dissertation]. Queen Mary, University of London; 2014. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8657 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.667262
Queen Mary, University of London
20.
Black, William.
Gravitational effects from amplitudes for string-brane interactions.
Degree: PhD, 2012, Queen Mary, University of London
URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8368
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664936
► In this thesis we examine both high and low energy gravitational phenomena using amplitudes derived from a quantum description of interactions between strings and branes.…
(more)
▼ In this thesis we examine both high and low energy gravitational phenomena using amplitudes derived from a quantum description of interactions between strings and branes. We demonstrate that the coupling of branes to the massless states of the closed string exactly match the couplings of these branes at low energy to the supergravity fields associated with these states. We examine the scattering of massive closed strings from a brane at high energy and large impact parameters and it is concluded that this process can be well approximated by an eikonal description.
Subjects/Keywords: 539.7; Physics; Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Black, W. (2012). Gravitational effects from amplitudes for string-brane interactions. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/8368 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664936
Chicago Manual of Style (16th Edition):
Black, William. “Gravitational effects from amplitudes for string-brane interactions.” 2012. Doctoral Dissertation, Queen Mary, University of London. Accessed February 28, 2021.
http://qmro.qmul.ac.uk/xmlui/handle/123456789/8368 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664936.
MLA Handbook (7th Edition):
Black, William. “Gravitational effects from amplitudes for string-brane interactions.” 2012. Web. 28 Feb 2021.
Vancouver:
Black W. Gravitational effects from amplitudes for string-brane interactions. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2012. [cited 2021 Feb 28].
Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8368 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664936.
Council of Science Editors:
Black W. Gravitational effects from amplitudes for string-brane interactions. [Doctoral Dissertation]. Queen Mary, University of London; 2012. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/8368 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664936
21.
Vanderbeke, Joachim.
Exploring galaxies through stellar kinematics and globular clusters.
Degree: 2014, Ghent University
URL: http://hdl.handle.net/1854/LU-4306662
► Astronomers have already gained a lot of insight into the formation and evolution of galaxies, such as our own Milky Way. Nevertheless, there are still…
(more)
▼ Astronomers have already gained a lot of insight into the formation and evolution of galaxies, such as our own Milky Way. Nevertheless, there are still many mysteries that keep puzzling us. In this thesis we have explored galaxies in various ways, with the objective to better interpret the observations and to improve our understanding of the physical properties of galaxies and their substructures.
The first part focuses on the stellar kinematics of early-type galaxies. The velocity dispersion (quantifying the internal speeds of the stars within a galaxy) is an important parameter in extragalactic scaling relations. However, we know that dust blocks and scatters the optical light of stars. Therefore, the determination of the velocity dispersion based on optical data could be unreliable. We address this problem by comparing optical velocity dispersions with velocity dispersions based on near-infrared data: this wavelength regime is much less affected by the complications introduced by the dust. We conclude that the optically-determined velocity dispersions for early-type galaxies are reliable, hence we can continue to use this parameter in extragalactic scaling relations.
In the second part of this thesis we investigate the globular clusters of our own galaxy, the Milky Way. These clusters are fossil records of the early formation of galaxies and are therefore very important in the study of the formation and evolution of galaxies. We have observed the bulk of those clusters with the new standard optical SDSS filter set during a large observational campaign. We determined the magnitudes and colours of each object and corrected for Galactic foreground stars which do not belong to the cluster itself. We related these clean colours to the metallicity (chemical properties) of these star clusters and demonstrated that the dust in the Milky Way disk complicates the determination of accurate optical colours. Moreover, we fitted theoretical models to surface brightness profiles that reveal the structure of the clusters and we can associate these characteristics with the cluster position within the Milky Way and with the age of the cluster.
Advisors/Committee Members: Baes, Maarten.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Vanderbeke, J. (2014). Exploring galaxies through stellar kinematics and globular clusters. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-4306662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vanderbeke, Joachim. “Exploring galaxies through stellar kinematics and globular clusters.” 2014. Thesis, Ghent University. Accessed February 28, 2021.
http://hdl.handle.net/1854/LU-4306662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vanderbeke, Joachim. “Exploring galaxies through stellar kinematics and globular clusters.” 2014. Web. 28 Feb 2021.
Vancouver:
Vanderbeke J. Exploring galaxies through stellar kinematics and globular clusters. [Internet] [Thesis]. Ghent University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1854/LU-4306662.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vanderbeke J. Exploring galaxies through stellar kinematics and globular clusters. [Thesis]. Ghent University; 2014. Available from: http://hdl.handle.net/1854/LU-4306662
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
22.
Wouters, Sebastian.
Accurate variational electronic structure calculations with the density matrix renormalization group.
Degree: 2014, Ghent University
URL: http://hdl.handle.net/1854/LU-4377157
► During the past fifteen years, the density matrix renormalization group (DMRG) has become increasingly important for ab initio quantum chemistry. Its underlying wavefunction ansatz, the…
(more)
▼ During the past fifteen years, the density matrix renormalization group (DMRG) has become increasingly important for ab initio quantum chemistry. Its underlying wavefunction ansatz, the matrix product state (MPS), is a low-rank decomposition of the full configuration interaction tensor. The virtual dimension of the MPS, the rank of the decomposition, controls the size of the corner of the many-body Hilbert space that can be reached with the ansatz. This parameter can be systematically increased until numerical convergence is reached.
Whereas the MPS ansatz can only capture exponentially decaying correlation functions in the thermodynamic limit, and will therefore only yield an efficient description for noncritical one-dimensional systems, it can still be used as a variational ansatz for finite-size systems. Rather large virtual dimensions are then required. The two most important aspects to reduce the corresponding computational cost are a proper choice and ordering of the active space orbitals, and the exploitation of the symmetry group of the Hamiltonian. By taking care of both aspects, DMRG becomes an efficient replacement for exact diagonalization in quantum chemistry. For hydrogen chains, accurate longitudinal static hyperpolarizabilities were obtained in the thermodynamic limit. In addition, the low-lying states of the carbon dimer were accurately resolved.
DMRG and Hartree-Fock theory have an analogous structure. The former can be interpreted as a self-consistent mean-field theory in the DMRG lattice sites, and the latter in the particles. It is possible to build upon this analogy to introduce post-DMRG methods. Based on an approximate MPS, these methods provide improved ansätze for the ground state, as well as for excitations. Exponentiation of the single-particle excitations for a Slater determinant leads to the Thouless theorem for Hartree-Fock theory, an explicit nonredundant parameterization of the entire manifold of Slater determinants. For an MPS with open boundary conditions, exponentiation of the single-site excitations leads to the Thouless theorem for DMRG, an explicit nonredundant parameterization of the entire manifold of MPS wavefunctions. This gives rise to the configuration interaction expansion for DMRG. The Hubbard-Stratonovich transformation lies at the basis of auxiliary field quantum Monte Carlo for Slater determinants. An analogous transformation for spin-lattice Hamiltonians allows to formulate a promising variant for matrix product states.
Advisors/Committee Members: Van Neck, Dimitri, Verschelde, Henri.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Wouters, S. (2014). Accurate variational electronic structure calculations with the density matrix renormalization group. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-4377157
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Wouters, Sebastian. “Accurate variational electronic structure calculations with the density matrix renormalization group.” 2014. Thesis, Ghent University. Accessed February 28, 2021.
http://hdl.handle.net/1854/LU-4377157.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wouters, Sebastian. “Accurate variational electronic structure calculations with the density matrix renormalization group.” 2014. Web. 28 Feb 2021.
Vancouver:
Wouters S. Accurate variational electronic structure calculations with the density matrix renormalization group. [Internet] [Thesis]. Ghent University; 2014. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1854/LU-4377157.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wouters S. Accurate variational electronic structure calculations with the density matrix renormalization group. [Thesis]. Ghent University; 2014. Available from: http://hdl.handle.net/1854/LU-4377157
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
23.
Vanderstraeten, Laurens.
Tensor network states and effective particles for low-dimensional quantum spin systems.
Degree: 2016, Ghent University
URL: http://hdl.handle.net/1854/LU-8501428
► In this dissertation the author develops new techniques for simulating the low-energy behaviour of quantum spin systems in one and two dimensions. These techniques arise…
(more)
▼ In this dissertation the author develops new techniques for simulating the low-energy behaviour of quantum spin systems in one and two dimensions. These techniques arise through the combination of two themes in many-particle
physics: (i) the concept of quasiparticles as the effective low-energy degrees of freedom in a condensed-matter system, and (ii) entanglement as the characteristic feature for describing quantum phases of matter. Whereas the former gave rise to the use of effective field theories for understanding many-particle systems, the latter led to the development of tensor network states as a description of the entanglement distribution in quantum low-energy states. Combining these developments, the author uses the formalism of tensor network states to derive an effective particle description for one- and two-dimensional spin systems that exhibit strong quantum correlations.
Advisors/Committee Members: Verstraete, Frank, Haegeman, Jutho.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Vanderstraeten, L. (2016). Tensor network states and effective particles for low-dimensional quantum spin systems. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-8501428
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vanderstraeten, Laurens. “Tensor network states and effective particles for low-dimensional quantum spin systems.” 2016. Thesis, Ghent University. Accessed February 28, 2021.
http://hdl.handle.net/1854/LU-8501428.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vanderstraeten, Laurens. “Tensor network states and effective particles for low-dimensional quantum spin systems.” 2016. Web. 28 Feb 2021.
Vancouver:
Vanderstraeten L. Tensor network states and effective particles for low-dimensional quantum spin systems. [Internet] [Thesis]. Ghent University; 2016. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1854/LU-8501428.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vanderstraeten L. Tensor network states and effective particles for low-dimensional quantum spin systems. [Thesis]. Ghent University; 2016. Available from: http://hdl.handle.net/1854/LU-8501428
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
24.
Martins Saraiva, Marta.
Sputter deposition of MgO thin films: the effect of cation substitution.
Degree: 2012, Ghent University
URL: http://hdl.handle.net/1854/LU-2100270
► The importance of thin films relies on their ability to modify in an easy and, in most cases, cost efficient way the surface properties of…
(more)
▼ The importance of thin films relies on their ability to modify in an easy and, in most cases, cost efficient way the surface properties of bulk materials and thus, their functionality. Thin films have been deposited already for a long time. Sputter deposition is a widely used technique since it combines versatility, control over the composition and microstructure, relatively high deposition rates and conceptual simplicity.
Most of the new technologically interesting materials have complex chemistry and crystalline structure. An example of the increased complexity is the ternary metal oxides of the group Mg-M-O, where M represents a metal other than Mg. This class of materials has gained considerable research attention the last years and Mg-M-O films find application in catalysis and surface protection, as well as in high-k dielectrics, ionic conductors, high Tc superconductors, and thin film batteries.
The goal of the present thesis is to contribute towards understanding the fundamental growth mechanisms of sputter deposited ternary oxide films with the general formula Mg-M-O (where M is a metal different than Mg). The key objectives of the study are:
(i) To establish the relation between the deposition conditions and the chemical composition in the Mg-M-O films and through this, achieve an efficient and accurate control over the film stoichiometry.
(ii) To understand the effect of the deposition conditions and the chemical composition on the structure formation and crystallographic properties of Mg-M-O films.
(ii) To elucidate the effect of chemistry and microstructure on a number of functional properties of the Mg-M-O films.
Films are deposited employing reactive magnetron sputtering (in an Ar-O2 atmosphere) from two (Mg and M) confocally arranged magnetron sources. This multisource approach facilitates a large flexibility with respect to the chemical compositions that can be accessed. In addition, the confocal arrangement of the sources leads to an off-normal deposition flux providing a tool to control and tune the crystallographic properties of the films. The metals (M) Al, Cr, Ti, Y and Zr are chosen to systematically vary key physical parameters of the substituting element in the metal sublattice of the Mg-M-O films, i.e. the valence electron number and the atomic size, and to study their largely unexplored effect on the film microstructure and crystallographic properties.
Advisors/Committee Members: Depla, Diederik.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Martins Saraiva, M. (2012). Sputter deposition of MgO thin films: the effect of cation substitution. (Thesis). Ghent University. Retrieved from http://hdl.handle.net/1854/LU-2100270
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Martins Saraiva, Marta. “Sputter deposition of MgO thin films: the effect of cation substitution.” 2012. Thesis, Ghent University. Accessed February 28, 2021.
http://hdl.handle.net/1854/LU-2100270.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Martins Saraiva, Marta. “Sputter deposition of MgO thin films: the effect of cation substitution.” 2012. Web. 28 Feb 2021.
Vancouver:
Martins Saraiva M. Sputter deposition of MgO thin films: the effect of cation substitution. [Internet] [Thesis]. Ghent University; 2012. [cited 2021 Feb 28].
Available from: http://hdl.handle.net/1854/LU-2100270.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Martins Saraiva M. Sputter deposition of MgO thin films: the effect of cation substitution. [Thesis]. Ghent University; 2012. Available from: http://hdl.handle.net/1854/LU-2100270
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oxford
25.
Lolachi, Ramin.
Hunting for water with MCS.
Degree: PhD, 2019, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:300fd088-f809-45bd-82a3-5c27e0093d43
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791687
► Mars Climate Sounder (MCS) is an infrared radiometer aboard NASA's Mars Reconnaissance Orbiter (MRO) launched in August 2005 and designed to characterize the temporal and…
(more)
▼ Mars Climate Sounder (MCS) is an infrared radiometer aboard NASA's Mars Reconnaissance Orbiter (MRO) launched in August 2005 and designed to characterize the temporal and spatial variation of temperature, dust and water profiles. MCS has nine spectral channels in the range 0.3-50 μm. An original goal of the mission was retrieval of vertical water profiles. This was to be done using two spectrally co-located channels (centred at 42 μm)-a narrow channel (B3), which was mainly sensitive to dust, and a broader overlapping channel (B2) sensitive to both dust and water. This has been severely compromised by the fact that the B2 and B3 filters did not meet their specification, with a much wider than expected spectral response. This thesis is split into three parts attempting to assess the current ability of MCS to retrieve water vapour. In the first part, work was done assessing the ramifications on the water vapour sensitivity of the B3-B2 pair and the B2 channel alone through extensive simulation work. The B3-B2 pair were found to have a drastically reduced sensitivity to water vapour that was further reduced by the presence of dust and low temperatures. Radiance residuals of B2 from MCS observations showed that a water vapour signal is present in the channel. Simulations of MCS radiances and retrieval of synthetic observations revealed that the accuracy of water vapour retrievals is sensitive to the choice of aerosol particle size and that in the presence of moderate aerosol opacity (dust and water ice), aerosol radiance contribution in B2 is falsely misinterpreted as water vapour. In the second part, work was done measuring the spectral response of the B3 filter in order to understand the process behind the spectral broadening in the B-channels. It was thought that random forward scattering of out-of-bandpass radiation by the mesh filter may be the cause of the widening. Using a custom-made jig and FTIR spectrometer, measurements were taken at several filter-detector separation distances. No change in the B3 response FWHM was observed as the distance was varied. In the final part, a two-stage retrieval method was applied to MCS observations for MY28 northern hemisphere summer (Ls=111-173°). Nightside vertical profiles of water vapour were retrieved for the first time showing interaction with the aphelion cloud belt directly. Possible interaction between dust and water cycles was seen. Retrieval results compared favourably with observations by others for both column abundances and vertical profiles. Of particular note was good agreement with results from Clancy et al. (2017) using vertical water profiles derived from CRISM retrievals of 1.27 μm O2 (1∆g) dayglow. A number of spurious retrievals were seen and these are attributed to the aerosol model choice problem seen in the simulations.
Subjects/Keywords: Astronomy; Atmospheric Physics
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lolachi, R. (2019). Hunting for water with MCS. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:300fd088-f809-45bd-82a3-5c27e0093d43 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791687
Chicago Manual of Style (16th Edition):
Lolachi, Ramin. “Hunting for water with MCS.” 2019. Doctoral Dissertation, University of Oxford. Accessed February 28, 2021.
http://ora.ox.ac.uk/objects/uuid:300fd088-f809-45bd-82a3-5c27e0093d43 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791687.
MLA Handbook (7th Edition):
Lolachi, Ramin. “Hunting for water with MCS.” 2019. Web. 28 Feb 2021.
Vancouver:
Lolachi R. Hunting for water with MCS. [Internet] [Doctoral dissertation]. University of Oxford; 2019. [cited 2021 Feb 28].
Available from: http://ora.ox.ac.uk/objects/uuid:300fd088-f809-45bd-82a3-5c27e0093d43 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791687.
Council of Science Editors:
Lolachi R. Hunting for water with MCS. [Doctoral Dissertation]. University of Oxford; 2019. Available from: http://ora.ox.ac.uk/objects/uuid:300fd088-f809-45bd-82a3-5c27e0093d43 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791687
26.
Scaramazza, Jasen A., 1990-.
Topics in classical and quantum integrability.
Degree: PhD, Condensed matter physics, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61000/
► This Thesis is an amalgamation of research I conducted as a physics graduate student at Rutgers University. Each chapter stands independently of the others with…
(more)
▼ This Thesis is an amalgamation of research I conducted as a physics graduate student at Rutgers University. Each chapter stands independently of the others with its own introduction and set of references, though Chapters 4 and 5 treat the same subject and may be read in succession. The chapters are presented roughly in reverse chronological order, so that the first chapters are my most recent work.
The common threads of this research program are the statistical and dynamical properties of many body systems, both in and out of equilibrium. Save for Chapter 6, the works are strongly associated with physical models called integrable, whose Hamiltonians have a comparatively large number of conservation laws with respect to generic models. Using numerical and analytical techniques, we shall explore the effects of integrability on a diverse set of phenomena including far-from-equilibrium steady states in Chapter 2, heat conductivity in Chapter 3, and Hamiltonian level statistics in Chapters 4-5. We also characterize these phenomena for systems that are not quite integrable, but are in certain ways close to integrable.
The chapters in this Thesis are based on the following works:
J. A. Scaramazza, P. Smacchia, and E. A. Yuzbashyan, Consequences of integrability breaking in quench dynamics of pairing Hamiltonians, Accepted by Phys. Rev. B Jan. 2019.
J. L. Lebowitz and J. A. Scaramazza, Ballistic Transport in the classical Toda chain with harmonic pinning, arXiv:1801.07153 (2018).
A. Dhar, A. Kundu, J. L. Lebowitz and J. A. Scaramazza, Transport properties of the classical Toda chain: effect of a pinning potential, arXiv:1812.11770 (2018). Submitted to J. Stat. Phys. Jan. 2019.
E. A. Yuzbashyan, B. S. Shastry and J. A. Scaramazza, Rotationally invariant ensembles of integrable matrices, Phys. Rev. E 93, 052114 (2016).
J. A. Scaramazza, B. S. Shastry and E. A. Yuzbashyan, Integrable matrix theory: Level statistics, Phys. Rev. E 94, 032106 (2016).
J. L. Lebowitz and J. A. Scaramazza, A note on Lee-Yang zeros in the negative half-plane, J. Phys.: Condens. Matter 28, 414004 (2016).
Advisors/Committee Members: Yuzbashyan, Emil A (chair), Lebowitz, Joel L (co-chair), Zamick, Larry (internal member), Gershenson, Michael (internal member), Ling, Hong Y (outside member), School of Graduate Studies.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Scaramazza, Jasen A., 1. (2019). Topics in classical and quantum integrability. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61000/
Chicago Manual of Style (16th Edition):
Scaramazza, Jasen A., 1990-. “Topics in classical and quantum integrability.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 28, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61000/.
MLA Handbook (7th Edition):
Scaramazza, Jasen A., 1990-. “Topics in classical and quantum integrability.” 2019. Web. 28 Feb 2021.
Vancouver:
Scaramazza, Jasen A. 1. Topics in classical and quantum integrability. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 28].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61000/.
Council of Science Editors:
Scaramazza, Jasen A. 1. Topics in classical and quantum integrability. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61000/
Rutgers University
27.
Brennan, Theodore Daniel, 1992-.
Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S.
Degree: PhD, Magnetic monopoles, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61697/
► Monopoles are a fundamental feature of non-abelian gauge theories. They are relevant to the study of confinement and general non-perturbative quantum effects. In this dissertation…
(more)
▼ Monopoles are a fundamental feature of non-abelian gauge theories. They are relevant to the study of confinement and general non-perturbative quantum effects. In this dissertation we study some aspects of monopoles in supersymmetric non-abelian gauge theories. In particular, we focus primarily on 't Hooft defects (magnetically charged defects) and their interaction with smooth, supersymmetric monopoles. Here we use a semiclassical approximation to study the spectrum of bound states between such monopoles and 't Hooft defects and the phase transitions where this spectrum changes discontinuously. Then, we use string theory and localization techniques to compute the expectation value of 't Hooft defects as operators in the full quantum theory. Using the computed expectation value, we are able to directly study the non-perturbative process called monopole bubbling in which smooth monopoles dissolve into an 't Hooft defect. Then, by combining the results of string theory techniques with localization techniques, we are able to derive general formulas for the full spectrum of monopole bound states in all possible phases of the theory.
Advisors/Committee Members: Moore, Gregory W. (chair), Friedan, Daniel (internal member), Buckley, Matthew (internal member), Thomas, Scott (internal member), Cordova, Clay (outside member), School of Graduate Studies.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Brennan, Theodore Daniel, 1. (2019). Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61697/
Chicago Manual of Style (16th Edition):
Brennan, Theodore Daniel, 1992-. “Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 28, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61697/.
MLA Handbook (7th Edition):
Brennan, Theodore Daniel, 1992-. “Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S.” 2019. Web. 28 Feb 2021.
Vancouver:
Brennan, Theodore Daniel 1. Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 28].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61697/.
Council of Science Editors:
Brennan, Theodore Daniel 1. Monopoles, BPS states, and 't Hooft defects in 4D N = 2 theories of class S. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61697/
Rutgers University
28.
Kyriacou, Savvas, 1988-.
Search for new physics in events with collimated photons and gluons.
Degree: PhD, Particles (Nuclear physics), 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61787/
► This thesis presents the design and results of a search for physics beyond the standard model in events containing jets with substructure resulting from new…
(more)
▼ This thesis presents the design and results of a search for physics beyond the standard model in events containing jets with substructure resulting from new particles decaying into a photon and two gluons. Jet substructure techniques are adapted to develop a new approach for photon identification in a dense hadronic environment. The analyzed proton-proton collision data were collected by the CMS experiment at center-of-mass energy of 13 TeV in 2016 and correspond to an integrated luminosity of 35.9 inverse femtobarns. No statistically significant excess is observed in data. The first cross section limits on new physics processes resulting in such events are set and interpreted in the context of a Stealth Supersymmetry model.
Advisors/Committee Members: Gershtein, Yuri (chair), Somalwar, Sunil (internal member), Thomas, Scott (internal member), Gersherson, Michael (internal member), Ruderman, Joshua (outside member), School of Graduate Studies.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kyriacou, Savvas, 1. (2019). Search for new physics in events with collimated photons and gluons. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61787/
Chicago Manual of Style (16th Edition):
Kyriacou, Savvas, 1988-. “Search for new physics in events with collimated photons and gluons.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 28, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61787/.
MLA Handbook (7th Edition):
Kyriacou, Savvas, 1988-. “Search for new physics in events with collimated photons and gluons.” 2019. Web. 28 Feb 2021.
Vancouver:
Kyriacou, Savvas 1. Search for new physics in events with collimated photons and gluons. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 28].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61787/.
Council of Science Editors:
Kyriacou, Savvas 1. Search for new physics in events with collimated photons and gluons. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61787/
Rutgers University
29.
Rivera, Jesus, 1990-.
Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey.
Degree: PhD, Galaxies, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/61925/
► Dusty star-forming galaxies (DSFGs) are some of the most luminous and rapidly star-forming systems in the Universe. However, the large dust content present in these…
(more)
▼ Dusty star-forming galaxies (DSFGs) are some of the most luminous and rapidly star-forming systems in the Universe. However, the large dust content present in these galaxies absorbs the optical light produced from stars and re-radiates it out to longer wavelengths, primarily in the infrared. As a result, this population of galaxies that are forming stars at rates of up 1000 Msun/year were missed in surveys that looked only in the optical regime. The true nature of these galaxies did not start to come to light until the late 1990s when they were discovered in large numbers in submillimeter surveys. In this thesis, I present results on the 30 brightest DSFGs among a larger sample first identified in the Atacama Cosmology Telescope 470 deg2 equatorial field survey observed at 148, 218, and 277 GHz. In Chapter 2, I present a detailed analysis from Northern Extended Millimeter Array (NOEMA) CO data of ACT J0209, a strongly-lensed source. In Chapter 3, I present a similar preliminary analysis on an additional source, ACT J2029, that combines the use of both NOEMA and Hubble Space Telesope (HST) data. In Chapter 4, I present a more sample-wide analysis by including additional NOEMA data and Submillimeter Array (SMA) data to characterize the physical properties of the sample. And finally in Chapter 5, I discuss future prospects for both the subsample of 30 DSFGs and the parent DSFG sample.
Advisors/Committee Members: Baker, Andrew J. (chair), Keeton, Charles R. (internal member), Hughes, John P. (internal member), Lee, Sang-Hyuk (internal member), Aguirre, James (outside member), School of Graduate Studies.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Rivera, Jesus, 1. (2019). Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/61925/
Chicago Manual of Style (16th Edition):
Rivera, Jesus, 1990-. “Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 28, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/61925/.
MLA Handbook (7th Edition):
Rivera, Jesus, 1990-. “Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey.” 2019. Web. 28 Feb 2021.
Vancouver:
Rivera, Jesus 1. Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 28].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61925/.
Council of Science Editors:
Rivera, Jesus 1. Detailed studies of dusty star-forming galaxies in the Atacama Cosmology Telescope equatorial survey. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/61925/
Rutgers University
30.
Zhang, Wenhan, 1990-.
Impact of point defects on electronic properties of topological materials.
Degree: PhD, Topological insulators – Electric properties, 2019, Rutgers University
URL: https://rucore.libraries.rutgers.edu/rutgers-lib/62091/
► Topological insulators and topological Weyl semimetals are both novel classes of quantum materials. They are characterized by the surface states arising from the nontrivial topology…
(more)
▼ Topological insulators and topological Weyl semimetals are both novel classes of quantum materials. They are characterized by the surface states arising from the nontrivial topology of band structure. The surface state of topological insulators exists in the band gap, which originates from the band inversion due to the strong spin-orbit interaction. The topological Weyl semimetals are characterized by the surface Fermi arcs that connects the projections of two Weyl nodes of opposite chiralities and unusual magnetotransport properties induced by the chiral anomaly. These topological materials not only introduce novel fundamental
physics concepts and properties, but also provide a new route to the development of technological applications of electronics, spintronics and topological quantum computation. Defects and impurities are inevitably present in all functional materials including topological materials. An important theme in the research of topological materials is to investigate and control defects. The goal of this doctoral thesis is to address the impact of point defects on the electronic properties of topological materials from several different perspectives.
First, we present the experimental studies on the topological insulator Bi2Se3 single crystals and thin films. The prominent native defects in Bi2Se3 single crystals are clearly identified. In particular, Se vacancies and Se interstitial defects are responsible for the spatial fluctuation and the bulk conduction. Through the optimization of synthesis process, the formation of native defects is effectively suppressed in the Bi2Se3 single crystal sample, which is approaching the intrinsic limit with the Fermi level inside the band gap. We also investigate the long-lasting p-type doping problem in Bi2Se3 thin films. We find that the obstacles are the excess n-type defects from the interface between sample and substrate and from the air exposure. By properly protecting the surface of thin films and applying buffer layer, we have achieved p-type Bi2Se3 thin films via compensation doping with calcium.
Next, we study the the topological phase transition in (Bi1-xInx)2Se3. We present compelling microscopic evidence of an inhomogeneous topological phase transition in this system, which is characterized by non-uniform spatial distributions of local band gap and topological surface states. The nanoscale inhomogeneity originates from effective suppression of local spin-orbit coupling and band topology by In defects. Our observations demonstrate that strong disorders can play a significant role in the topological phase transition.
Then we investigate the distributions of electronic defect states of magnetic dopants vanadium(V) and chromium(Cr) in the topological insulator (Bi,Sb)2Te3, which is the parent compound to achieve the quantum anomalous Hall effect. The spectroscopic imaging shows very diverse distributions of local defect states of V and Cr. These unique spectroscopic features of the two dopants serve as electronic fingerprints to study the Cr/V-codoped…
Advisors/Committee Members: Wu, Weida (chair), Chandra, Premala (internal member), Kiryukhin, Valery (internal member), Gawiser, Eric (internal member), Wray, Lewis Andrew (outside member), School of Graduate Studies.
Subjects/Keywords: Physics and Astronomy
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhang, Wenhan, 1. (2019). Impact of point defects on electronic properties of topological materials. (Doctoral Dissertation). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/62091/
Chicago Manual of Style (16th Edition):
Zhang, Wenhan, 1990-. “Impact of point defects on electronic properties of topological materials.” 2019. Doctoral Dissertation, Rutgers University. Accessed February 28, 2021.
https://rucore.libraries.rutgers.edu/rutgers-lib/62091/.
MLA Handbook (7th Edition):
Zhang, Wenhan, 1990-. “Impact of point defects on electronic properties of topological materials.” 2019. Web. 28 Feb 2021.
Vancouver:
Zhang, Wenhan 1. Impact of point defects on electronic properties of topological materials. [Internet] [Doctoral dissertation]. Rutgers University; 2019. [cited 2021 Feb 28].
Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/62091/.
Council of Science Editors:
Zhang, Wenhan 1. Impact of point defects on electronic properties of topological materials. [Doctoral Dissertation]. Rutgers University; 2019. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/62091/
◁ [1] [2] [3] [4] [5] … [85] ▶
. 
Open Access Theses and Dissertations
