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Dissertations / Theses on the topic 'Quantum Gravity and Time'

Author: Grafiati

Published: 7 June 2025

Last updated: 16 July 2025

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1

Arzano, Michele Ng Yee Jack. "Aspects of quantum gravity quantum space-time and black hole thermodynamics /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,144.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Physics & Astronomy." Discipline: Physics and Astronomy; Department/School: Physics and Astronomy.

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2

Jacobson, David. "Spectral modulation, gravity and time-dependent correlations in neutron interferometry /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9720550.

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3

Crystal, Lisa. "Quantum Times: Physics, Philosophy, and Time in the Postwar United States." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10973.

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The concept of time in physics underwent significant changes in the decades following World War II. This dissertation considers several ways in which American physicists grappled with these changes, analyzing the extent to which philosophical methods and questions played a role in physicists' engagement with time. Two lines of questioning run through the dissertation. The first asks about the professional identities of postwar American physicists in relation to philosophy, as exemplified by their engagement with the concept of time. The second analyzes the heterogeneous nature of time in physi

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4

Wells, Clive Gene. "The application of differential geometry to classical and quantum gravity." Thesis, University of Cambridge, 1999. https://www.repository.cam.ac.uk/handle/1810/283187.

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5

Hersent, Kilian. "Field theories on quantum space-times : towards the phenomenology of quantum gravity." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP031.

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La géométrie noncommutative est un formalisme mathématique qui exprime la structure de l’espace-temps avec des algèbres d’opérateurs. On s’attend à ce que les espace-temps noncommutatifs fassent émerger des effets de gravité quantiques, au moins dans un certain régime, notamment parce qu’ils utilisent les outils de la mécanique quantique pour décrire la géométrie. Ce manuscrit se concentre sur les aspects physiques de ces espace-temps quantiques, tout particulièrement à travers le formalisme des théories de champs et de jauge. Il est montré que les théories de champs scalaires engendrent possi

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6

Pérez, Rodríguez Jeinny Nallely. "A study of the problem of time in a Friedmann quantum cosmology." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21716/.

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After reviewing Dirac's canonical quantization program and the canonical quantization of General Relativity, we study the problem of time in the context of a quantum minisuperspace cosmological model: a Friedmann-Lemaître-Robertson-Walker spacetime coupled minimally to a scalar field. We explore different methods to include time and evolution in our formalism. We begin by discussing the possibility to identify a dynamical time variable before quantization. Such a time variable is constructed as a function of the phase space variables and leads to a multiple choice problem for the evolution of

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7

Neri, Giulio. "Effective metric for bootstrapped Newtonian sources." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21717/.

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In this work, we address the problem of constructing an effective space-time picture for the gravitational field in the bootstrapped Newtonian theory (BNT). After a short review of the singularity problem and the corpuscular model of black holes, we present a detailed introduction to the BNT. This theory provides us with an exact formula for the gravitational potential felt by slowly-moving particles outside a static and spherically symmetric source. Our goal is to determine the most general metric tensor that reproduces this potential in the Newtonian limit and use it in relativistic or stro

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8

Dempsey, Patrick. "On the Compatibility of Presentism and our most fundamental Physics." Thesis, Department of Philosophy, 2013. http://hdl.handle.net/2123/10247.

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It has been alleged that Presentism is incompatible with our most fundamental physics. More specifically, it is argued that this follows from the fact that Presentism and The Special Theory of Relativity are incompatible. The aim of this thesis is to assess whether the Presentist can refute this argument. I shall argue that whilst it is problematic for the Presentist to dispute the claim that their theory is incompatible with The Special Theory of Relativity, they can successfully refute the argument that their theory is therefore incompatible with our most fundamental theories of physics. My

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9

Davis, Simon. "The quantum cosmological wavefunction at very early times for a quadratic gravity theory." Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2008/2652/.

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The quantum cosmological wavefunction for a quadratic gravity theory derived from the heterotic string effective action is obtained near the inflationary epoch and during the initial Planck era. Neglecting derivatives with respect to the scalar field, the wavefunction would satisfy a third-order differential equation near the inflationary epoch which has a solution that is singular in the scale factor limit a(t) → 0. When scalar field derivatives are included, a sixth-order differential equation is obtained for the wavefunction and the solution by Mellin transform is regular in the a → 0 limit

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10

PINNA, SIMONLUCA. "Time in Nicolai Hartmann's philosophy." Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266498.

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The present work is divided into two parts. The first (only in Italian) is an analysis of some texts about time in Nicolai Hartmann's works, and especially in Möglichkeit und Wirklichkeit (1938) and Philosophie der Natur (1950). The second part is a theoretical discussion of one of the main problems concerning time in the contemporary philosophy (and in the philosophy of physics in particular), i.e., the problem of the unreality of time. Some recent theses will be compared and analyzed in the light of Hartmann's critical ontology. The scope of Part II is to evaluate whether and how Hartm

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11

Troessaert, Cédric. "Aspects of duality in gravitational theories." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209892.

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Un des grand défis de la physique actuelle est la quantification de la gravit é. La théorie d’Einstein est remarquable pour ses prédictions. Malheureusement, elle reste une théorie classique et de ce fait en désaccord avec les progrès actuels en physique des particules qui montrent qu’à faible distance, une théorie physique doit être quantique. Une des pistes pour résoudre ce problème est d’étudier la version classique de la gravité dans l’espoir d’en déduire des propriétés ou même la forme de la théorie quantique.<p><p>Un des outils pour étudier une theorie est la notion de dualité. On dit qu

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12

Bianchi, Eugenio. "Loop Quantum Gravity." Doctoral thesis, Scuola Normale Superiore, 2010. http://hdl.handle.net/11384/85828.

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13

Mannellli, Lorenzo. "Quantum gravity and cosmology /." Diss., Digital Dissertations Database. Restricted to UC campuses, 2005. http://uclibs.org/PID/11984.

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14

Ali, Ahmed Farag. "Aspects of quantum gravity." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Physics and Astronomy, c2012, 2012. http://hdl.handle.net/10133/3119.

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We propose a Generalized Uncertainty Principle (GUP) consistent with String Theory, Black Hole Physics and Doubly Special Relativity. This modifies all quantum mechanical Hamiltonians and predicts quantum gravity corrections. We compute corrections to the Lamb shift, simple harmonic oscillator, Landau levels, and the tunneling current. When applied to an elementary particle, it suggests that the space must be quantized, and that all measurable lengths are quantized in units of a fundamental length. We investigated whether GUP can explain the violation of the equivalence principle at small len

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15

Whitt, Brian. "Gravity : a quantum theory?" Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304522.

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16

Mackay, Paul. "Low energy quantum gravity." Thesis, University of Newcastle Upon Tyne, 2012. http://hdl.handle.net/10443/1752.

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This thesis investigates two very different aspects of quantum gravity. In the first - and main - section, we examine the question of quantum gravitational contributions to the running of a coupling parameter alongside the various problems and issues that this raises. We treat quantum gravity as an e ective eld theory and use perturbative methods to address issues. Speci cally, we look at a '4-type scalar coupling. In a gauge-invariant way, we consider a non-minimally coupled, massive scalar eld, with non-constant background, in the presence of a cosmological constant and contrary to most of t

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17

Liu, Hongguang. "Aspects of quantum gravity." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0209.

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Cette thèse concerne principalement, sans toutefois s'y limiter, le problème de la gravité quantique dans le contexte de la gravité quantique en boucle. Les deux aspects fondamentaux et les conséquences physiques de la gravité à boucles sont étudies dans ce travail. Nous étudions l'invariance de Lorentz de la gravité quantique de la boucle, à la fois dans l'approche canonique et dans le modelé de mousse de spin. Nous présentons une description de jauge su(1,1) de la théorie de la gravité en quatre dimensions, au lieu de la description habituelle su(2). Nous étudions la quantification de

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18

Gupta, Arun K. Wise Mark B. Wise Mark B. "Quantum aspects of gravity /." Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-06072007-083631.

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19

Gong, Yungui. "Issues in quantum gravity /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008342.

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20

Flori, Cecilia. "Approaches to quantum gravity." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16344.

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In dieser Arbeit beschäftigen wir uns mit zwei Ansätzen zur Quantengravitation (QG), die einander konträr gegenüberstehen: - Erstens mit der Loop Quantum Gravity (LQG), einem eher konservativen Ansatz zur QG, dessen Startpunkt eine Hamiltonsche Formulierung der klassischen Allgemeinen Relativitätstheorie (ART) ist, - zweitens mit der sogenannten Topos-Theorie, angewandt auf die Allgemeine Relativitätstheorie, die die mathematischen Konzepte der Quantentheorie (und möglicherweise auch der ART) radikal umformuliert, was eine immense Redefinition von Konzepten wie Raum, Zeit und Raumzeit zur Folg

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21

Kerr, Steven. "Topological quantum field theory and quantum gravity." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14094/.

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This thesis is broadly split into two parts. In the first part, simple state sum models for minimally coupled fermion and scalar fields are constructed on a 1-manifold. The models are independent of the triangulation and give the same result as the continuum partition functions evaluated using zeta-function regularisation. Some implications for more physical models are discussed. In the second part, the gauge gravity action is written using a particularly simple matrix technique. The coupling to scalar, fermion and Yang-Mills fields is reviewed, with some small additions. A sum over histories

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22

Ingram, David. "Using systems theory to do philosophy : one approach, and some suggested terminology : a thesis submitted in fulfilment of the requirements for the degree of Master of Arts in Philosophy in the University of Canterbury /." Thesis, University of Canterbury. Philosophy and Religious Studies, 2007. http://hdl.handle.net/10092/1022.

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This thesis employs perspectives inspired by General Systems Theory to address issues in philosophy, including moral philosophy and philosophy of mind. I present an overview of a range of ideas from the study of physical systems that may be used to provide a firm physicalist foundation to explorations of some common questions in philosophy. I divide these topics into three categories: the Physical Category, the Relevance Category and the Signal Elements Category. I interpret concepts from General Systems Theory, including information and entropy, in a way that I believe facilitates their incor

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23

Eriksen, Matin Børstad. "Dark energy from quantum gravity." Thesis, Norwegian University of Science and Technology, Department of Physics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-6225.

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<p> The thesis consists of two parts, where the last one tries to model the evolution of the universe by using a scalar field. Within this class of models there is a huge amount of freedom and few simple restrictions. Often only examples are studied which are just tested against a subset of the requirements. In a try of being more systematic I developed a simulation for proposing and testing different evolutions of the universe more comprehensively.</p><p> A large subset of the proposed models pass the tests, and singling out models against observed requirements is like trying to start from th

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24

Starodubtsev, Artem. "Topological methods in quantum gravity." Thesis, University of Waterloo, 2005. http://hdl.handle.net/10012/1217.

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The main technical problem with background independent approaches to quantum gravity is inapplicability of standard quantum field theory methods. New methods are needed which would be adapted to the basic principles of General Relativity. Topological field theory is a model which provides natural tools for background independent quantum gravity. It is exactly soluble and, at the same time, diffeomorphism invariant. Applications of topological field theory to quantum gravity include description of boundary states of quantum General Relativity, formulation of quantum gravity as a

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25

Markopoulou, Fotini G. "Constraints in canonical quantum gravity." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/11817.

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26

Lafrance, René. "Two investigations in quantum gravity." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40375.

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Two aspects of quantum field theory in curved spacetimes are discussed. First, the limits for applicability of the equivalence principle in the context of low energy effective field theories is considered. In particular, we find three classes of higher-derivative interactions for the gravitational and electromagnetic fields which produce dispersive photon propagation. One of these classes of interactions also produces birefringent propagation. This result is illustrated by calculating the energy-dependent contribution to the bending of light. In the second part, the divergences appearing in st

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27

Grant, James D. E. "Spacetime distortion and quantum gravity." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321392.

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28

Garcia, Raquel Soledad. "Topology change in quantum gravity." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322405.

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29

NEDAL, RAFAEL KAUFMANN. "SEMICLASSICAL STATES IN QUANTUM GRAVITY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2006. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=8988@1.

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FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>A teoria da gravidade quântica em laços (loop quantum gravity ou LQG) é atualmente uma das mais promissoras abordagens para descrever a relatividade geral em termos quânticos. Um dos problemas-chave é detectar na teoria quântica estados semiclássicos, que apresentem propriedades macroscópicas iguais às de configurações específicas da teoria clássica. Nesta dissertação, começamos apresentando o formalismo da LQG e sua interpretação física. Do ponto de vista matemático, a LQG pode ser pensada como uma quantização canônica de u

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30

Jubb, Ian. "Causal structure and quantum gravity." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/56610.

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In this thesis we will investigate the problem of quantum gravity from a variety of directions. Each avenue we explore begins at the quantum gravity path integral, and throughout our investigations the notion of spacetime causal structure will frequently appear. After a brief introduction to the path integral for quantum gravity we will present several of the concepts behind Causal Set Theory - an approach to quantum gravity in which the continuum spacetime is replaced by a discrete structure. We will then familiarise ourselves with the gravitational action that appears in the path integral, a

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31

Lavdas, Ioannis. "AdS₄/CFT₃ and quantum gravity." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEE041.

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Dans le cadre de la dualité holographique entre une vaste famille de vides 1/2-maximalement supersymétriques Anti-de Sitter à quatre dimensions (AdS₄) et des théories des champs superconformes N=4 supersymétriques à trois dimensions (sCFT₃), nous étudions des questions théoriques majeures de gravité quantique et de théories de jauge. Ce travail a deux directions principales : La premiere partie est consacrée aux mécanismes par lesquels le graviton AdS₄ peut acquérir une petite masse, tandis que la seconde partie concerne la cartographie de la variété superconforme des sCFT₃ considérées. En ce

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32

Pfeffer, Joshua William. "Frontiers of Liouville quantum gravity." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126933.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 317-336).<br>Abstract This thesis studies a universal model of random geometry in two dimensions called Liouville quantum gravity (LQG). LQG was originally described heuristically by physicists, and mathematicians have grappled with the challenge of defining it rigorously and analyzing its properties. We investigate elements of the theory of LQG that are still poorly understood, often even from physicists' heuris

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33

Ridgway, Stuart Alexander Preskill John P. "Wormholes in Euclidean quantum gravity /." Diss., Pasadena, Calif. : California Institute of Technology, 1992. http://resolver.caltech.edu/CaltechETD:etd-12082008-100051.

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34

Minassian, Eric Azarian. "Spacetime singularities in quantum gravity /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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35

Rodigast, Andreas. "Renormalisation in perturbative quantum gravity." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://dx.doi.org/10.18452/16571.

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In dieser Arbeit berechnen wir die gravitativen Ein-Schleifen-Korrekturen zu den Propagatoren und Wechselwirkungen der Felder des Standardmodells der Elementarteilchenphysik. Wir betrachten hierzu ein höherdimensionales brane-world-Modell: Wärend die Gravitonen, die Austauchteilchen der Gravitationswechselwirkung, in der gesamten D-dimensionalen Raumzeit propagieren können, sind die Materiefelder an eine d-dimensionale Untermanigfaltigkeit (brane) gebunden. Um die divergenten Anteile der Ein-Schleifen-Diagramme zu bestimmen, entwickeln wir ein neues Regularisierungschema welches einerseits di

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36

Schkolnik, Vladimir. "Probing gravity with quantum sensors." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2017. http://dx.doi.org/10.18452/17676.

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Quantensensoren, wie Atominterferometer und Atomuhren werden zu hochpräzisen und akkuraten Messungen von Inertialkräften und der Zeit benutzt und sind hervorragend dazu geeignet fundamentale Fragestellungen der Physik anzugehen und die Aussagen der allgemeinen Relativitätstheorie zu testen. Die Empfindlichkeit von Atominterferometern skaliert quadratisch mit der freien Entwicklungszeit und die Verwendung von Quantensensoren im Weltraum ist prädestiniert die Genauigkeit von Tests des Äquivalenzprinzips um mehrere Größenordnungen zu verbessern. Zusätzlich, werden präzise und akkurate Sensoren f

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37

Conrady, Florian. "Semiclassical analysis of loop quantum gravity." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=982087144.

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38

Sahlmann, Hanno. "Coupling matter to loop quantum gravity." Phd thesis, [S.l. : s.n.], 2002. http://pub.ub.uni-potsdam.de/2002/0032/sahlmann.pdf.

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39

Markopoulou-Kalamara, Fotini Georgia. "Abelian constraints in canonical quantum gravity." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695329.

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40

Haghnegahdar, Poya. "Observables and dynamics in quantum gravity." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/13913.

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The treatment of quantum constraint theories in physics is considered. These systems exist in many different branches of physics. One noticeable case is the quantum theory of gravity (which is a completely constraint system). We contrast two modern methods of solving such quantum constraint systems, namely the method used in the String Theory - BRST Quantization, and that used in Loop Quantum Gravity - the Loop Quantization. We investigate these methods and the quantum solution space they produce - along with proper observables - for the case of a discrete closed string. This system has t

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41

Teo, Edward H. K. "Geometry and topology in quantum gravity." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337207.

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42

Giulini, D. "3-manifolds in canonical quantum gravity." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333324.

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43

De, Medeiros Paul Francis. "Duality in non-pertubative quantum gravity." Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397234.

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44

Kimberly, Dagny Maria. "Testing quantum gravity with observational puzzles." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423102.

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45

Kimpton, Ian. "Classical and quantum modifications of gravity." Thesis, University of Nottingham, 2013. http://eprints.nottingham.ac.uk/13430/.

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Einstein’s General Relativity has been our best theory of gravity for nearly a century, yet we know it cannot be the final word. In this thesis, we consider modifications to General Relativity, motivated by both high and low energy physics. In the quantum realm, we focus on Horava gravity, a theory which breaks Lorentz invariance in order to obtain good ultraviolet physics by adding higher spatial derivatives to the action (improving propagator behaviour in loops) but not temporal (avoiding Ostrogradski ghosts). By using the Stückelberg trick, we demonstrate the necessity of introducing a Lore

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46

Schröder, Jan. "Aspects of quantum gravity and matter." Thesis, University of Sussex, 2015. http://sro.sussex.ac.uk/id/eprint/54172/.

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A quantum theory of gravity remains one of the greatest challenges of contemporary physics. It is well established that a perturbative treatment of gravity as a quantum field theory leads to a non-renormalisable setup. However gravity could still exist as a consistent and predictive quantum field theory on a non-perturbative level. This is explored in the asymptotic safety scenario which was initially proposed by S. Weinberg. In this thesis we investigate the ultraviolet behaviour of gravity within the asymptotic safety conjecture and discuss phenomenological implications. We start out by intr

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47

De, Cesare Marco. "Cosmological consequences of Quantum Gravity proposals." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/cosmological-consequences-of-quantum-gravity-proposals(fbc51bef-e427-4126-8462-e40014b77318).html.

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In this thesis, we study the implications of Quantum Gravity models for the dynamics of spacetime and the ensuing departures from classical General Relativity. The main focus is on cosmological applications, particularly the impact of quantum gravitational effects on the dynamics of a homogenous and isotropic cosmological background. Our interest lies in the consequences for the evolution of the early universe and singularity resolution, as well as in the possibility of providing an alternative explanation for dark matter and dark energy in the late universe. The thesis is divided in two parts

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48

Lifschytz, Gilad. "Quantum gravity and topological field theory." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/33529.

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49

Keski-Vakkuri, Esko Olavi. "Topics in semiclassical and quantum gravity." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/32658.

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50

Ionicioiu, Radu. "Topology in 3-dimensional quantum gravity." Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624257.

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