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You searched for +publisher:"Michigan State University" +contributor:("Dykman, Mark"). Showing records 1 – 3 of 3 total matches.

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Michigan State University

1. Morris, Titus Dan. Systematic improvements of ab-initio in-medium similarity renormalization group calculations.

Degree: 2016, Michigan State University

Thesis Ph. D. Michigan State University. Physics 2016

The In-Medium Similarity Renormalization Group (IM-SRG) is an ab initio many-body method that has enjoyed increasing prominence in nuclear theory, due to its soft polynomial scaling with system size, and the flexibility to target ground and excited states of both closed- and open-shell systems. Despite many successful applications of the IM-SRG to microscopic calculations of medium-mass nuclei in recent years, the conventional formulation of the method suffers a number of limitations. Key amongst these are i) large memory demands that limit calculations in heavier systems and render the calculation of observables besides energy spectra extremely difficult, and ii) the lack of a computationally feasible sequence of improved approximations that converge to the exact solution in the appropriate limit, thereby verifying that the IM-SRG is systematically improvable. In this thesis, I present a novel formulation of the IM-SRG based on the Magnus expansion. I will show that this improved formulation, guided by intuition gleaned from a diagrammatic analysis of the perturbative content of different truncations and parallels with coupled-cluster theory, allows one to bypass the computational limitations of traditional implementations, and provides computationally viable approximations that go beyond the truncations used to date. The effectiveness of the new Magnus formulation is illustrated for several many-nucleon and many-electron systems.

Description based on online resource;

Advisors/Committee Members: Bogner, Scott K, Dykman, Mark, Hjorth-Jensen, Morten, Nunes, Filomena, Piecuch, Piotr.

Subjects/Keywords: Nuclear physics – Mathematical models; Mass (Physics) – Measurement; Physics; Nuclear physics and radiation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Morris, T. D. (2016). Systematic improvements of ab-initio in-medium similarity renormalization group calculations. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3864

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):

Morris, Titus Dan. “Systematic improvements of ab-initio in-medium similarity renormalization group calculations.” 2016. Thesis, Michigan State University. Accessed September 26, 2020. http://etd.lib.msu.edu/islandora/object/etd:3864.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Morris, Titus Dan. “Systematic improvements of ab-initio in-medium similarity renormalization group calculations.” 2016. Web. 26 Sep 2020.

Vancouver:

Morris TD. Systematic improvements of ab-initio in-medium similarity renormalization group calculations. [Internet] [Thesis]. Michigan State University; 2016. [cited 2020 Sep 26]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3864.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Morris TD. Systematic improvements of ab-initio in-medium similarity renormalization group calculations. [Thesis]. Michigan State University; 2016. Available from: http://etd.lib.msu.edu/islandora/object/etd:3864

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Michigan State University

2. Zhang, Yaxing. Fluctuation spectra of mesoscopic vibrational systems.

Degree: 2016, Michigan State University

Thesis Ph. D. Michigan State University. Physics 2016

We study the spectra of fluctuations in linear and nonlinear vibrational systems. Fluctuations play a major role in mesoscopic systems explored in nanomechanics, cavity and circuit quantum electrodynamics, and Josephson junction based systems to mention but a few. We find that important insights into the nature of the fluctuations can be gained by investigating the system dynamics in the presence of periodic driving. This is because the interplay of the driving and fluctuations leads to specific pronounced spectral features. Our predictions are corrobarated by measurements on a carbon nanotube resonator which show that the theory allows one both to reveal and to characterize frequency fluctuations in a vibrational system, as well as to determine the decay rate without ring-down measurements. Our results bear on the general area of decoherence of mesoscopic oscillators and also on the classical problems of resonance fluorescence and light scattering by oscillators. An important and poorly understood mechanism of fluctuations in mesoscopic systems is the dispersive mode coupling. This coupling is inherent essentially to all mesoscopic systems. It comes from the nonlinear interaction between vibrational modes with non-resonating frequencies. We consider the power spectrum of one of these modes. Thermal fluctuations of the modes nonlinearly coupled to it lead to fluctuations of the mode frequency and thus to the broadening of its spectrum. However, the coupling-induced broadening is partly masked by the spectral broadening due to the mode decay. We show that the effect of the mode coupling can be identified and characterized using the change of the spectrum by resonant driving. The theoretical analysis is complicated by the fact that the dispersive-coupling induced fluctuations are non-Gaussian. We develop a path-integral method of averaging over the fluctuations and obtain the power spectrum in an explicit form. The shape of the spectrum depends on the interrelation between the coupling strength and the decay rates of the modes involved, providing a means of characterizing these modes even where they cannot be directly accessed. The analysis is extended to the case of coupling to many modes which, because of the cumulative effect, can become effectively strong. We also find the power spectrum of a driven mode where the mode has internal nonlinearity. Unexpectedly, for a driven mode, the power spectra dominated by the intra- and inter-mode nonlinearities are qualitatively different. The analytical results are in excellent agreement with the numerical simulations.Of significant interest for physics and biophysics are overdamped mesoscopic and microscopic systems. Inertial effects play no role in their dynamics. We show that where such systems are periodically driven, along with the conventional delta-peak at the driving frequency their power spectra display extra features. These can be peaks or dips with height quadratic in the driving amplitude, for weak driving.…

Advisors/Committee Members: Dykman, Mark, Birge, Norman, Pratt, Scott, Schmidt, Carl, Shaw, Steve.

Subjects/Keywords: Mesoscopic phenomena (Physics); Vibrational spectra; Coupled mode theory; Physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Zhang, Y. (2016). Fluctuation spectra of mesoscopic vibrational systems. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3954

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):

Zhang, Yaxing. “Fluctuation spectra of mesoscopic vibrational systems.” 2016. Thesis, Michigan State University. Accessed September 26, 2020. http://etd.lib.msu.edu/islandora/object/etd:3954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Zhang, Yaxing. “Fluctuation spectra of mesoscopic vibrational systems.” 2016. Web. 26 Sep 2020.

Vancouver:

Zhang Y. Fluctuation spectra of mesoscopic vibrational systems. [Internet] [Thesis]. Michigan State University; 2016. [cited 2020 Sep 26]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3954.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhang Y. Fluctuation spectra of mesoscopic vibrational systems. [Thesis]. Michigan State University; 2016. Available from: http://etd.lib.msu.edu/islandora/object/etd:3954

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


Michigan State University

3. Ittisamai, Pawin. Strong dynamics at the LHC.

Degree: 2014, Michigan State University

Thesis Ph. D. Michigan State University. Physics 2014.

The limitations of the Standard Model of particle physics, despite its being a well-established theory, have prompted various proposals for new physics capable of addressing its shortcomings. The particular issue to be explored here is the mechanism of electroweak symmetry breaking, the probing of which lies within the TeV-scale physics accessible to the Large Hadron Collider (LHC). This thesis focuses on the phenomenology of a class of models featuring a dynamical breaking of the electroweak symmetry via strong dynamics. Consequences of recent experiments and aspects of near-future experiments are presented.We study the implications of the LHC Higgs searches available at the time the related journal article was written for technicolor models that feature colored technifermions. Then we discuss the properties of a technicolor model featuring strong-top dynamics that is viable for explaining the recently discovered boson of mass 126 GeV. We introduce a novel method of characterizing the color structure of a new massive vector boson, often predicted in various new physics models, using information that will be promptly available if it is discovered in the near-future experiments at the LHC. We generalize the idea for more realistic models where a vector boson has flavor non-universal couplings to quarks. Finally, we discuss the possibilities of probing the chiral structure of a new color-octet vector boson.

Description based on online resource; title from PDF t.p. (viewed on Oct. 16, 2017)

Advisors/Committee Members: Chivukula, R. Sekhar, Simmons, Elizabeth, Schmidt, Carl R., Dykman, Mark I., Schwienhorst, Reinhard H..

Subjects/Keywords: Large Hadron Collider (France and Switzerland); Particles (Nuclear physics); Nuclear physics; Electroweak interactions; Strong interactions (Nuclear physics); Phenomenology; Particle physics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Ittisamai, P. (2014). Strong dynamics at the LHC. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:3055

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):

Ittisamai, Pawin. “Strong dynamics at the LHC.” 2014. Thesis, Michigan State University. Accessed September 26, 2020. http://etd.lib.msu.edu/islandora/object/etd:3055.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Ittisamai, Pawin. “Strong dynamics at the LHC.” 2014. Web. 26 Sep 2020.

Vancouver:

Ittisamai P. Strong dynamics at the LHC. [Internet] [Thesis]. Michigan State University; 2014. [cited 2020 Sep 26]. Available from: http://etd.lib.msu.edu/islandora/object/etd:3055.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ittisamai P. Strong dynamics at the LHC. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:3055

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.