Open Access Theses and Dissertations

Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · date | New search

Dates: Last 2 Years ❌

You searched for subject:(Planck scale). Showing records 1 – 3 of 3 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Waterloo

1. Pye, Jason. On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/16427 

It is widely believed that combining the uncertainty principle with gravity will lead to an effective minimum length scale. A particular challenge is to specify this scale in a coordinate-independent manner so that covariance is not broken. Here we will consider bandlimitation and sampling theory as a means to model Planck-scale modifications to spacetime within quantum field theory. Two different cases will be considered. The first is the case of Euclidean-bandlimitation, which imposes a notion of minimal length while preserving Euclidean symmetries. This leads to a sampling theory where one can represent fields as equivalently living on either continuous space or on lattices. We will discuss how this leads to a regulation of the information density in quantum fields. We then proceed to quantify notions of localization and density of degrees of freedom within these fields. We then turn to the case of Lorentzian-bandlimitation. Quantum fields bandlimited in this way have reconstruction properties which are qualitatively different than the Euclidean case. Nevertheless, here we will examine what impacts this has on the structure of quantum field theory with such a bandlimit imposed. In particular, we will investigate which quantities are and are not regulated by the Lorentzian bandlimit in both free and interacting field theories.

Subjects/Keywords: quantum field theory; sampling theory; bandlimited quantum field theory; entanglement; entropy; localization; Planck scale; minimum length; generalized uncertainty principle

Record Details  Similar Records    Google PlusoneFacebookTwitterCiteULikeMendeleyreddit

❌

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

APA (6th Edition):

Pye, J. (2020). On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/16427

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):

Pye, Jason. “On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory.” 2020. Thesis, University of Waterloo. Accessed January 22, 2021. http://hdl.handle.net/10012/16427.

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

MLA Handbook (7th Edition):

Pye, Jason. “On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory.” 2020. Web. 22 Jan 2021.

Vancouver:

Pye J. On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/10012/16427.

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

Council of Science Editors:

Pye J. On the Application of Bandlimitation and Sampling Theory to Quantum Field Theory. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/16427

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

2. Bui, Van Tuan. A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid.

Degree: Docteur es, Physique de l'Univers.Cosmologie, 2019, Sorbonne Paris Cité

URL: http://www.theses.fr/2019USPCC022 

L'étude de la structure à grande échelle de l'univers est l'un des éléments les plus importants pour comprendre l'origine et l'évolution de l'Univers. Les amas de galaxies qui se sont formés à partir d'effondrements gravitationnels dans le champ de densité cosmique sont les plus grandes structures gravitationnelles liées. En utilisant la corrélation à deux points, nous pouvons quantifier le regroupement des galaxies aux échelles spatiale et angulaire. Le catalogue d’amas de la mission Planck contient des sources détectées par l'effet Sunyaev-Zel’dovich (SZ) pendant les 29 mois d’observation de la mission. C'est le plus grand catalogue d’amas SZ existant. Il couvre environ 85% du ciel. Dans cette thèse, nous étudions la fonction de corrélation angulaire à deux points w (thêta) de ce catalogue. Nous avons obtenu une indication d’un signal de regroupement des amas de Planck avec décalage vers le rouge inférieur à 0,4 et un rapport signal sur bruit SNR ≥ 6. Nous avons aussi détecté significatif pour un décalage vers le rouge z <0,2 et SNR ≥ 6. La corrélation des amas de Planck s'avère tout à fait compatible avec notre prédiction. Nous explorons également le potentiel de la fonction de corrélation à deux points ξ (r) du catalogue de halos de matière noire de la simulation Flagship Euclid. Euclid est une mission spatiale en cours de développement visant à étudier l’énergie noire et la matière noire en mesurant l’expansion accélérée de l’univers. Nous avons trouvé que la corrélation entre les halos de matière noire de la simulation Flagship évolue avec le décalage vers le rouge. Sur des échelles inférieures à 60 h-1 Mpc, la corrélation du halo de matière noire est bien ajustée par une loi de puissance avec une longueur de corrélation entre 16 et 19 h-1 Mpc selon le décalage vers le rouge. Nous avons également mis en évidence la signature BAO (Baryonic Acoustic Oscillations) dans les groupes avec décalage vers le rouge z> 0,2. Enfin, nous montrons également, dans le contexte du défi scientifique 3 du consortium Euclid, les résultats de la validation de données de simulations des données externes nécessaires à Euclid. Dans cette partie, nous présentons des méthodes pour mesurer la photométrie, des outils astronomiques pour mesurer l'astrométrie, extraire des objets d'une image astronomique.

Studying the large-scale structure of the universe is one of the most important elements to understand the origin and evolution of the universe. Galaxy clusters which formed from gravitational collapses in the cosmic density field are the largest gravitationally bound structures. Using the two-point correlation we can quantify the clustering of galaxy clusters in both spatial and angular scales. Many galaxy surveys have been carried out for similar purpose. The Planck Sunyaev-Zel’dovich (SZ) cluster catalog contains sources detected through the SZ effect from the 29-month full sky Planck mission. This is the largest SZ cluster catalog and it covers about 85% of the sky. In this thesis, we investigate the angular two-point correlation…

Advisors/Committee Members: Beckmann, Volker (thesis director), Rosset, Cyrille (thesis director).

Subjects/Keywords: Cosmologie; Structure à grande échelle; Amas de galaxies; Catalogue des amas de Planck SZ; Oscillations acoustiques des baryons; Matière noire; Énergie noire; Fonction corrélation à deux points; Cosmology; Large-scale structure; Galaxy clusters; Planck SZ cluster catalog; Baryonic Acoustic Oscillations; Dark matter; Dark energy; Two-point correlation function

Record Details  Similar Records    Google PlusoneFacebookTwitterCiteULikeMendeleyreddit

❌

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

APA (6th Edition):

Bui, V. T. (2019). A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid. (Doctoral Dissertation). Sorbonne Paris Cité. Retrieved from http://www.theses.fr/2019USPCC022

Chicago Manual of Style (16th Edition):

Bui, Van Tuan. “A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid.” 2019. Doctoral Dissertation, Sorbonne Paris Cité. Accessed January 22, 2021. http://www.theses.fr/2019USPCC022.

MLA Handbook (7th Edition):

Bui, Van Tuan. “A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid.” 2019. Web. 22 Jan 2021.

Vancouver:

Bui VT. A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid. [Internet] [Doctoral dissertation]. Sorbonne Paris Cité; 2019. [cited 2021 Jan 22]. Available from: http://www.theses.fr/2019USPCC022.

Council of Science Editors:

Bui VT. A study of the large-scale structure of the universe with galaxy clusters : from Planck to Euclid : Une étude de la structure à grande échelle de l'Univers avec des amas de galaxies : de Planck à Euclid. [Doctoral Dissertation]. Sorbonne Paris Cité; 2019. Available from: http://www.theses.fr/2019USPCC022


Brno University of Technology

3. Zembol, Filip. Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/18522 

The topic of my thesis is the analysis of parameters of the infrared imaging and the use of radiation laws for the formation of a thermographic equation, which will include the impact of surrounding factors on the resulting temperature relief of the scanned object. These factors include the temperature of the surrounding atmosphere, temperature of the surrounding radiation sources, emissivity coefficients, reflection and transmission. On the basis of this equation a programme will be created in the MATLAB environment where the resulting temperature relief of the simulated object and the impact of the particular parameters from the equation will be graphically depicted. In the thesis we will first of all introduce the infrared radiation, its types and features. With the help of the particular radiation laws and distracting elements of the infrared radiation a formula including the distracting elements appearing during scanning of the thermal surface relief will be formed. This formula will enable us to count the surface temperature of the scanned scene and to determine the final temperature without the impact of the unwanted parameters. Furthermore, a programme which will image thermograms on the basis of the thermography equation will be designed. The thermogram will change in dependance on the changes of the parameters in the thermography equation. The change will be expressed by the change of temperatures in the scanned scene and by the shift in the colour spectrum (thermographic scale). This programme will graphically present the changes of the quantities influencing the resulting temperature division in the scene and will provide a better grasp of the influence and the function of particular quantities in the thermographic equation. Advisors/Committee Members: Čech, Petr (advisor), Drastich, Aleš (referee).

Subjects/Keywords: Infračervené záření; koeficient emisivity; koeficient reflexe; koeficient transmise; MATLAB; teplota; spektrální intenzita záření; Stefan-Boltzmannův vyzařovací zákon; Planckův vyzařovací zákon; šedé těleso; absolutně černé těleso; termografická stupnice; termogram; rovnice kvantitativní termografie.; Infrared radiation; emissivity coefficient; reflection coefficient; transmission coefficient; MATLAB; temperature; spectral radiation intensity; Stefan-Boltzmann Radiation Law; Planck Radiation Law; grey body; absolute black body; thermographic scale; thermogram; quantitative thermography equation.

Record Details  Similar Records    Google PlusoneFacebookTwitterCiteULikeMendeleyreddit

❌

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

APA (6th Edition):

Zembol, F. (2019). Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/18522

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):

Zembol, Filip. “Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters.” 2019. Thesis, Brno University of Technology. Accessed January 22, 2021. http://hdl.handle.net/11012/18522.

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

MLA Handbook (7th Edition):

Zembol, Filip. “Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters.” 2019. Web. 22 Jan 2021.

Vancouver:

Zembol F. Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 22]. Available from: http://hdl.handle.net/11012/18522.

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

Council of Science Editors:

Zembol F. Analýza parametrů infračerveného zobrazení: Analysis of infrared acquisition parameters. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/18522

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

.