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Dissertations / Theses on the topic 'Classical theories of gravity'

Author: Grafiati

Published: 9 March 2023

Last updated: 25 July 2025

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1

Talaganis, Spyridon. "Classical and quantum aspects of infinite derivative field theories and infinite derivative gravity." Thesis, Lancaster University, 2017. http://eprints.lancs.ac.uk/88133/.

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The objective of this thesis is to study classical and quantum aspects of infinite derivative field theories and infinite derivative gravity. In- finite derivative theories of gravity can be made free from ghosts and classical singularities. In order to avoid ghosts, one modifies the graviton propagator by employing entire functions so that no new poles are introduced apart from the pole corresponding to the massless graviton of General Relativity. Inspired by infinite derivative gravity, we consider an infinite derivative scalar toy model and demonstrate renormalisability when the loop-order

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2

Belov, Vadim [Verfasser], and Benjamin [Akademischer Betreuer] Bahr. "On Geometry and Symmetries in Classical and Quantum Theories of Gauge Gravity / Vadim Belov ; Betreuer: Benjamin Bahr." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1186891742/34.

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3

Di, Casola Eolo. "Sieving the Landscape of Gravity Theories. From the Equivalence Principles to the Near-Planck Regime." Doctoral thesis, SISSA, 2014. http://hdl.handle.net/20.500.11767/3911.

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This thesis focusses on three main aspects of the foundations of any theory of gravity where the gravitational field admits a geometric interpretation: (a) the principles of equivalence; (b) their role as selection rules in the landscape of extended theories of gravity; and (c) the possible modifications of the spacetime structure at a "mesoscopic" scale, due to underlying, microscopic-level, quantum-gravitational effects. The first result of the work is the introduction of a formal definition of the Gravitational Weak Equivalence Principle, which expresses the universality of free fall of

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4

Vernieri, Daniele. "Gravity beyond General Relativity: New Proposals and their Phenomenology." Doctoral thesis, SISSA, 2014. http://hdl.handle.net/20.500.11767/3860.

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This Thesis is devoted to the study of phenomenologically viable gravitational theories, in order to address the most pressing open issues both at very small and very large energy scales. Lovelock’s theorem singles out General Relativity as the only theory with secondorder field equations for the metric tensor. So, two possible ways to circumvent it and modify the gravitational sector are taken into account. The first route consists in giving up diffeomorphism invariance, which generically leads to extra propagating degrees of freedom. In this framework Horava gravity is discussed, presenti

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5

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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6

Chimento, S. "BLACK HOLE DYNAMICS IN GENUINE AND FAKE GAUGED SUPERGRAVITY." Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/259452.

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The goal of this thesis is to obtain and study new black hole solutions, both with and without supersymmetry, with a particular focus on multi-centered black holes in a cosmological background. After a review of matter-coupled N=2 gauged supergravity in four dimensions and of the classification of its supersymmetric solutions, a new supersymmetric black hole solution is obtained, which is the first with nontrivial running hyperscalars. Fake supergravity is a framework that allows to apply the methods used to classify supersymmetric solutions of supergravity also to theories without supersymm

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7

Sbisa, Fulvio. "Modified theories of gravity." Thesis, University of Portsmouth, 2013. https://researchportal.port.ac.uk/portal/en/theses/modified-theories-of-gravity(3b9310e3-5d97-4e48-aa05-0444d1e89363).html.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we c

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8

Clifton, Timothy. "Alternative theories of gravity." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612712.

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9

Sbisa', F. "MODIFIED THEORIES OF GRAVITY." Doctoral thesis, Università degli Studi di Milano, 2013. http://hdl.handle.net/2434/214951.

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The recent observational data in cosmology seem to indicate that the universe is currently expanding in an accelerated way. This unexpected conclusion can be explained assuming the presence of a non-vanishing yet extremely fine tuned cosmological constant, or invoking the existence of an exotic source of energy, dark energy, which is not observed in laboratory experiments yet seems to dominate the energy budget of the Universe. On the other hand, it may be that these observations are just signalling the fact that Einstein's General Relativity is not the correct description of gravity when we c

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10

Gullu, Ibrahim. "Massive Higher Derivative Gravity Theories." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613975/index.pdf.

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In this thesis massive higher derivative gravity theories are analyzed in some detail. One-particle scattering amplitude between two covariantly conserved sources mediated by a graviton exchange is found at tree-level in D dimensional (Anti)-de Sitter and flat spacetimes for the most general quadratic curvature theory augmented with the Pauli-Fierz mass term. From the amplitude expression, the Newtonian potential energies are calculated for various cases. Also, from this amplitude and the propagator structure, a three dimensional unitary theory is identified. In the second part of the thes

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11

Bahamonde, Sebastian. "Modified teleparallel theories of gravity." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10055604/.

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Teleparallel gravity is an alternative formulation of gravity which has the same field equations as General Relativity (GR), therefore, it is also known as the Teleparallel equivalent of General Relativity (TEGR). This theory is a gauge theory of the translations with the torsion tensor being non-zero but with a vanishing curvature tensor, hence, the manifold is globally flat. An interesting approach for understanding the late-time accelerating behaviour of the Universe is called modified gravity where GR is extended or modified. In the same spirit, since TEGR is equivalent to GR, one can cons

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12

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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13

Michele, Oliosi. "New viable theories of modified gravity : Minimal Theories and Quasidilaton." Kyoto University, 2019. http://hdl.handle.net/2433/244509.

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14

German, Velarde G. "Aspects of gravity and supergravity theories." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380006.

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15

Uddin, Kotub. "The viability of modified gravity theories." Thesis, Queen Mary, University of London, 2009. http://qmro.qmul.ac.uk/xmlui/handle/123456789/386.

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This thesis studies the viability of classes of modified gravity (MG) theories based on generalisations of the Einstein-Hilbert action. Particular emphasis is given to f(R) theories in both the metric and Palatini formalisms, scalar-tensor theories and generalised Gauss-Bonnet theories. An urgent task at present is to devise stringent tests in order to reduce the range of candidate models based on these theories. In this thesis a detailed study is made of the viability of these models using constraints from requirement of stability, background cosmological dynamics, local gravity constraints (

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16

Oreta, Timothy. "Vector-Galileon-Tensor theories of gravity." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20925.

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A detailed study of the cosmological evolution in a particular vector-tensor theory of gravity with a potential and a Galileon-motivated interaction terms is presented. The evolution of vector field self interactions that are relatively related to Galileon fields throughout the expansion history of the universe is considered and a classification of the parameters M (mass term) and H (Hubble parameter) according to the behaviour of the field in each cosmological epoch is carried out. In particular, we obtain conditions for the parameters so that the field grows exponentially or oscillates with

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17

Hackebill, Aric. "Thermodynamics of Modified Theories of Gravity." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2143.

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Einstein’s equations are derived by following Jacobson’s thermodynamic method. It is seen that a family of possible field equations exist which satisfy the thermodynamic argument. Modified theories of gravity are addressed as possible candidates for replacing dark matter as an explanation for anomalous cosmological phenomena. Many of the proposed modified theories are not powerful enough to explain the currently observed phenomena and are rejected as viable theories of gravity. A surviving candidate, TeVeS, is further analyzed under the aforementioned thermodynamic argument to check for it

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18

Cremonesi, Stefano. "Cascading theories in gauge/gravity duality." Doctoral thesis, SISSA, 2008. http://hdl.handle.net/20.500.11767/4096.

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19

Steinhaus, Sebastian. "Constructing quantum spacetime : relation to classical gravity." Phd thesis, Universität Potsdam, 2014. http://opus.kobv.de/ubp/volltexte/2015/7255/.

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Despite remarkable progress made in the past century, which has revolutionized our understanding of the universe, there are numerous open questions left in theoretical physics. Particularly important is the fact that the theories describing the fundamental interactions of nature are incompatible. Einstein's theory of general relative describes gravity as a dynamical spacetime, which is curved by matter and whose curvature determines the motion of matter. On the other hand we have quantum field theory, in form of the standard model of particle physics, where particles interact via the remaining

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20

Warnick, Claude Miles. "Dynamical problems in classical and quantum gravity." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611744.

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21

Soo, Chopin. "Classical and quantum gravity with Ashtekar variables." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/38626.

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22

Lundmark, Kristofer. "Gravity approach to strongly coupled gauge theories." Thesis, Uppsala universitet, Teoretisk fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-155121.

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A written report of a paper titled Holographic dual of collimated radiation by Veronika E. Hubeny where a new and easier method is proposed to estimate the “radiation due to an accelerated quark in a strongly coupled medium”. The method is able to reproduce the results from an earlier paper without the need of solving the linearized Einstein equations but by way of calculating geodesics in AdS using the AdS/CFT correspondence and the gravitational dual of the quark being a string. A quick introduction to synchrotron radiation and general relativity is given after which the AdS/CFT corresponden

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23

Hovdebo, Jordan. "Instabilities in Higher-Dimensional Theories of Gravity." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2967.

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A number of models of nature incorporate dimensions beyond our observed four. In this thesis we examine some examples and consequences of classical instabilities that emerge in the higher-dimensional theories of gravity which can describe their low energy phenomenology. <br /><br /> We first investigate a gravitational instability for black strings carrying momentum along an internal direction. We argue that this implies a new type of solution that is nonuniform along the extra dimension and find that there is a boost dependent critical dimension for which they are stable. Our ana

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24

Zlosnik, Thomas. "cosmological consequences of modified theories of gravity." Thesis, University of Oxford, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504343.

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25

Lima, Nelson Daniel de Aguiar. "Dark energy and modified theories of gravity." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/23558.

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It is now a consolidated fact that our Universe is undergoing an accelerated expansion. According to Einstein's General Relativity, if the main constituents of our Universe were ordinary and cold dark matter, then we would expect it to be contracting and collapsing due to matter's attractive nature. The simplest explanation we have for this acceleration is in the form of a component with a negative ratio of pressure to density equal to -1 known as cosmological constant, Λ , presently dominating over baryonic and cold dark matter. However, the Λ Cold Dark Matter (Λ CDM) model suffers from a wel

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26

Mifsud, Jurgen. "Cosmological consequences of theories of modified gravity." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/21618/.

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Our theoretical understanding of the dynamical evolution of the Universe has certainly improved during the recently established era of precision cosmology. However, the nature of the dark sector remains the greatest puzzle in cosmology. Although we re–establish that the concordance model of cosmology is in agreement with current cosmological observations, this simplistic model is unequivocally theoretically unappealing. Thence, we investigate a number of alternative cosmological models and illustrate their distinctive cosmological consequences. For instance, we consider a scalar–tensor theory

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27

Colombo, Mattia. "Aspects of Lorentz violating theories of gravity." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/38419/.

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Lorentz symmetry is arguably the most fundamental symmetry of physics, at least in its modern conception. On the other hand, some of the issues that plague the currently accepted theory of gravitation could be solved by breaking such symmetry. The theory proposed by Petr Horava in 2009 brings forward exactly this aspect. The theory, dubbed Horava gravity, is a UV complete theory of gravity that is also renormalisable. It represents therefore a good candidate for a quantum theory of gravity. There are some issues though, which typically arise in any theory which explicitely violates Lorentz sym

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28

Cerioni, Alessandro <1982&gt. "Cosmological perturbations in generalized theories of gravity." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3562/1/Cerioni_Alessandro_tesi.pdf.

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The first part of the thesis concerns the study of inflation in the context of a theory of gravity called "Induced Gravity" in which the gravitational coupling varies in time according to the dynamics of the very same scalar field (the "inflaton") driving inflation, while taking on the value measured today since the end of inflation. Through the analytical and numerical analysis of scalar and tensor cosmological perturbations we show that the model leads to consistent predictions for a broad variety of symmetry-breaking inflaton's potentials, once that a dimensionless parameter entering into t

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29

Cerioni, Alessandro <1982&gt. "Cosmological perturbations in generalized theories of gravity." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3562/.

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The first part of the thesis concerns the study of inflation in the context of a theory of gravity called "Induced Gravity" in which the gravitational coupling varies in time according to the dynamics of the very same scalar field (the "inflaton") driving inflation, while taking on the value measured today since the end of inflation. Through the analytical and numerical analysis of scalar and tensor cosmological perturbations we show that the model leads to consistent predictions for a broad variety of symmetry-breaking inflaton's potentials, once that a dimensionless parameter entering into t

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30

Sebastiani, Lorenzo. "General Aspects of Modified Theories of Gravity." Doctoral thesis, Università degli studi di Trento, 2011. https://hdl.handle.net/11572/367870.

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The aim of this work is to investigate the both, some mathematical and physical general aspect of modified gravity, and, more specifically, the proprieties of viable, realistic models of modified gravity which can be used to reproduce the inflation and the dark energy epoch of universe today.

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31

Sebastiani, Lorenzo. "General Aspects of Modified Theories of Gravity." Doctoral thesis, University of Trento, 2011. http://eprints-phd.biblio.unitn.it/672/1/TESI.pdf.

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The aim of this work is to investigate the both, some mathematical and physical general aspect of modified gravity, and, more specifically, the proprieties of viable, realistic models of modified gravity which can be used to reproduce the inflation and the dark energy epoch of universe today.

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32

Schritt, Dimitri. "Symmetries in quantum and classical field theories." Thesis, University of Canterbury. Physics and Astronomy, 2013. http://hdl.handle.net/10092/8032.

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The initial chapter of the thesis provides a review of Weinberg’s formalism for the derivation of quantum fields. The formalism is extended to allow for the derivation of quantum fields with more than one spin degree of freedom. It is conjectured that it may be possible to construct massive bosonic quantum field theories of any desired spin j that are consistent and unitary at all energies without the need for regulator terms by including j + 1 spin degrees of freedom: j, j - 1, down to j - j. The concept is then demonstrated in two subsequent chapters by the derivation of a quantum field with

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33

Högås, Marcus. "On the consistency of multigravity theories." Thesis, Stockholms universitet, Fysikum, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-136315.

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In this thesis a set of recently proposed multigravity theories is analysed. In the special case of bimetric gravity, the theory has been conclusively shown to be ghost-free. On the other hand, for multigravity theories in general, the ghost-issue has not been settled conclusively. Motivated by this fact, the main object of this thesis is to clarify what has been proven so far and what issues that still needs to be addressed. We also provide new calculations and results pointing in the direction that the multigravity theories must be restricted to a set of bimetric Hassan-Rosen couplings in a

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34

Alty, Lloyd John. "Topology and signature in classical and quantum gravity." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338085.

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35

Chamblin, Howard Andrew. "Aspects of topology in classical and quantum gravity." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627092.

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36

Scott, Andrew J. "Classical and quantum nonlinear dynamics /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16384.pdf.

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37

Rajamanoharan, Senthooran. "Cosmic superstrings and bimetric gravity." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610853.

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38

Meyer, Frank. "Gauge-Field Theories and Gravity on Noncommutative Spaces." Diss., lmu, 2006. http://nbn-resolving.de/urn:nbn:de:bvb:19-53357.

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39

Banahene-Sabulsky, Dylan. "Constraining theories of modified gravity with atom interferometry." Thesis, Imperial College London, 2018. http://hdl.handle.net/10044/1/62326.

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Matter-wave interferometry is ideal for detecting small forces, being able to sense changes of acceleration as small as 1 nm s^-2 as a result of quantum interference. In this thesis, I prepare a cloud of ultracold Rb-87 atoms and measure the force between an atom and a cm-sized source mass using atom interferometry. The interferometer uses a sequence of optical Raman pulses to split, reflect, and recombine the atomic wavefunction. The force that is measured is consistent with standard Newtonian gravity. Some theories that have been advanced to explain the accelerating expansion of the universe

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40

Li, Baojiu. "Physical and cosmological implications of modified gravity theories." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611653.

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41

Lovis, Kenneth John. "Strings, branes, and gravity duals of gauge theories." Thesis, Durham University, 2002. http://etheses.dur.ac.uk/4128/.

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We study the correspondence between certain supersymmetric gauge theories and their dual supergravity descriptions. Using low-energy brane probes of the super-gravity geometries we find moduli spaces of vacua, as expected from considering the dual gauge theories. The metrics on these spaces can be put into a form consistent with field theory expectations. This provides a non-trivial check on the supergravity solutions, in addition to strong-coupling predictions for the gauge theories. In the case of N = 2 supersymmetric gauge theory, proposed supergravity duals have previously been shown, usin

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42

Darmé, Luc. "Unconventional particle behaviours in supersymmetric theories and gravity." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066161/document.

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Nous étudions dans un premier temps deux théories supersymétriques basées sur la présence de Gauginos de Dirac à travers deux scénarios à la phénoménologie bien distincte. La première, dite de "Fake Split SUSY", se caractérise par un spectre de particules scindé entre une partie à l'échelle électrofaible et l'autre plus lourde. Ces modèles prédisent avec une grande précision la masse du boson de Higgs et sont compatibles avec de nombreux résultats de cosmologie, au prix d'un spectre très peu naturel. La seconde présente un scénario supersymétrique dont l'un des bosons scalaire pourrait être id

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43

von, Braun-Bates F. "Non-linear gravitational collapse in extended gravity theories." Thesis, University of Oxford, 2017. http://ora.ox.ac.uk/objects/uuid:910fd25d-38e0-4bd4-84cf-bf5c196c8f99.

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General Relativity (GR) is one theory amongst a wider range of plausible descriptions of the Universe. The aim of this thesis is to examine the behaviour of so-called screened theories, which are designed to avoid local tests of modified gravity (MG). We establish that these theories may be treated in a unified manner in the context of halo formation. A prerequisite for this is the clarification that the quasi-static approximation can be applied in cosmologically-plausible scenarios. Amongst the plethora of MG theories, we select three, each of which exhibit a different form of screening. This

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44

Cofano, M. C. "Chiral deformations of Yang-Mills and Gravity theories." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/50369/.

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In this thesis we present a modification of Yang-Mills and Gravity theories both written in terms of gauge connections. In particular gravity is presented in its pure connection formulation realizing a Diffeomorphism Invariant Gauge Theory. The modifications do not change the kinematical content of the theories, but they add an infinite set of new vertices retaining the symmetries of the original Lagrangians without introducing higher derivatives in the equations of motion. These new interactions are chiral, leaving the original Yang Mills and Gravity theories as the only parity-invariant theo

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45

Li, Wenliang. "Aspects of Gravitational Theories : holography and modified gravity." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC288.

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Dans cette thèse, nous étudions deux aspects de la théorie de la gravitation : la correspondance holographique et les théories de la gravité modifiée. La correspondance holographique est une conjecture remarquable qui établit l'équivalence entre certaines théories de la gravitation et certaines théories quantiques des champs. Les recherches dans le domaine de la gravité modifiée portent sur le développement des théories cohérentes de la gravité qui diffèrent de la relativité générale d'Einstein. La première partie de la thèse est dédiée à la correspondance holographique, ou la dualité gauge/gr

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46

Roa, Aguirre Alexis [UNESP]. "Type-II defects in integrable classical field theories." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/102532.

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Made available in DSpace on 2014-06-11T19:32:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-09-27Bitstream added on 2014-06-13T20:23:07Z : No. of bitstreams: 1 roaaguirre_a_dr_ift.pdf: 584228 bytes, checksum: a9374484aaeff9b04bf55be78fb96d03 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Nesta tese discutimos as propriedades de integrabilidade das teorias de campo clássicas em duas dimensões na presença de descontinuidades ou defeitos tipo-II, principalmente usando a linguagem do formalismo do espalhamento inverso. Um método geral para calcular a função

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47

Kerr, Prudence Marion. "Classical theories of endogenous growth and technological change." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284210.

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48

Roa, Aguirre Alexis. "Type-II defects in integrable classical field theories /." São Paulo, 2012. http://hdl.handle.net/11449/102532.

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Orientador: Abraham Hirsz Zimerman<br>Banca: Clisthenis Ponce Constantinidis<br>Banca: Harold Socrates Blas Achic<br>Banca: Andrei Mikhailov<br>Banca: Marcio José Martins<br>Resumo: Nesta tese discutimos as propriedades de integrabilidade das teorias de campo clássicas em duas dimensões na presença de descontinuidades ou defeitos tipo-II, principalmente usando a linguagem do formalismo do espalhamento inverso. Um método geral para calcular a função geradora de um conjunto inﬁnito de grandezas conservadas modiﬁcadas para qualquer equação de campo integrável é apresentado, uma vez que seus respe

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49

Nesrallah, Michael. "Kerr Nonlinear Instability: Classical and Quantum Optical Theories." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39432.

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An important aspect of third-order optical nonlinearity is the intensity-dependent refractive index, where the intensity of the light itself affects the refractive index. This nonlinear effect is known as Kerr nonlinearity. In this work, a theory of amplification based on Kerr nonlinearity is developed. Kerr nonlinearity is well known to exhibit instability. Our amplification theory is based on seeding this instability. The full theory is developed to obtain the vectorial wave equations of the instability. It is shown that for materials of interest, vectorial effects are negligible across the

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50

Akbar, M. M. "Boundary-value problems in quantum gravity and classical solutions." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595407.

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Abstract:

It is proved that Taub-Bolt infillings are double-valued whereas Taub-Nut and Eguchi-Hanson infillings are unique in arbitrary dimensions. In the case of trivial bundles, there are two or no Schwarzschild infillings. The condition of whether a particular type of infilling exists can be expressed as a limitation on squashing through a functional dependence on dimension in each case. The case of the Eguchi-Hanson metric is solved in arbitrary dimension. The Taub-Nut and the Taub-Bolt are solved in four dimensions and methods for higher dimensions are discussed. For the case of Schwarzschild in a

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