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Dissertations / Theses on the topic 'Relativity theories'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Mercer, Rebekah M. "Theories of Relativity." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc278201/.

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Theories of Relativity is a post-modern novella that questions the authority of truth. Multiple perspectives are utilized in the narrative to recount how the murder of a young girl has affected the tragedy's survivors. The focus of the narrative is not to determine the innocence or guilt of the accused, but to show how perspective influences our perception of truth. Eighteen pages of prefatory remarks comprise the body of an essay that explores the parameters of truth.

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2

Iberê, Oliveira Kuntz de Souza. "Gravitational theories beyond general relativity." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/80678/.

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Despite the success of general relativity in explaining classical gravitational phenomena, several problems at the interface between gravitation and high energy physics remain open to date. The purpose of this thesis is to explore classical and quantum gravity in order to improve our understanding of different aspects of gravity, such as dark matter, gravitational waves and ination. We focus on the class of higher derivative gravity theories as they naturally arise after the quantization of general relativity in the framework of effective field theory. The inclusion of higher order curvature i

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3

Vetharaniam, I. "Simultaneity and test-theories of relativity." Thesis, University of Canterbury. Physics, 1995. http://hdl.handle.net/10092/8027.

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Two intertwined issues in special relativity-clock synchronisation and the experimental verification of special relativity-are investigated, and novel results are given in both areas. The validity of the conventionality of distant simultaneity is supported, and the special theory of relativity is recast in a general synchrony "gauge" to reveal the operational significance of synchronisation in measurement and prediction within special relativity. For similar reasons, the Mansouri-Sexl test-theory is extended to allow arbitrary synchrony to be properly taken into account in the verification of

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4

Lonsdale, S. R. "Some cosmological aspects of unified theories." Thesis, University of Newcastle Upon Tyne, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378849.

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5

Fariña, Sierra Noela. "Cosmological Perturbations in Einstein-Aether Theories." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/111045.

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In this thesis we study the Einstein-Aether (E-A) theory from the point of view of its cosmological perturbations. We are interested in the constraints that may be obtained from this analysis and the special features that can arise from the vector mode, absent in General Relativity. We apply the theory of linear perturbations in an expanding universe to describe the growth of inhomogeneities on subhorizon scales after recombination. We can split the perturbations in the different modes (scalar, vector and tensor) and we can study each of them separately. This allow us to obtain the stabili

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6

Tatum, Brian Shane. "Relativity In Transylvania And Patusan: Finding The Roots Of Einstein’s Theories Of Relativity In Dracula And Lord Jim." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103399/.

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This thesis investigates the similarities in the study of time and space in literature and science during the modern period. Specifically, it focuses on the portrayal of time and space within Bram Stoker’s Dracula (1897) and Joseph Conrad’s Lord Jim (1899-1900), and compares the ideas presented with those later scientifically formulated by Albert Einstein in his special and general theories of relativity (1905-1915). Although both novels precede Einstein’s theories, they reveal advanced complex ideas of time and space very similar to those later argued by the iconic physicist. These ideas f

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7

Lehmkuhl, Dennis. "Spacetime matters on super-substantivalism, general relativity, and unified field theories." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527350.

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8

Dehouck, François. "Electric and magnetic aspects of gravitational theories." Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209867.

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Cette thèse se consacre premièrement à certains aspects de la définition de charges conservées en relativité générale pour les espaces asymptotiquement plats à l’infini spatial. À l’aide de la dualité gravitationnelle, présente au niveau linéarisé, on étudie également l’existence de charges topologiques, magnétiques, ainsi que leurs contributions aux superalgèbres dans les théories de supergravité N = 1 et N = 2 à quatre dimensions. La thèse est divisée en trois parties.<p>Dans la première partie, les espaces asymptotiquement plats à l’infini spatial sont décrits à l’aide d’une généralisation

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9

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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10

Muench, Uwe. "Studies in the physical foundations of gravitational theories /." free to MU campus, to others for purchase, 2002. http://wwwlib.umi.com/cr/mo/fullcit?p3060127.

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11

Lim, Hyun. "Dynamical Compact Objects in Numerical Relativity." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7729.

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The work of this dissertation will study various aspects of the dynamics of compact objects using numerical simulations.We consider BH dynamics within two modified or alternative theories of gravity. Within a family of Einstein-Maxwell-Dilaton-Axion theories, we find that the GW waveforms from binary black hole (BBH) mergers differ from the standard GW waveform prediction of GR for especially large axion values. For more astrophysically realistic (i.e. smaller) values, the differences become negligible and undetectable. Weestablish the existence of a well-posed initial value problem for a seco

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12

Panassiti, Antonio. "General relativity limit of Brans-Dicke gravity." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23344/.

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In Brans-Dicke gravity a scalar field non-minimally coupled with the curvature acts as a new gravitational degree of freedom in addition to the usual metric field of General Relativity. Usually, when the coupling ω of the scalar field diverges, the latter approaches a constant and the solutions of the theory reduce to those generated by the Einstein equations with the same energy-momentum tensor as source. However, in the limit ω → ∞, the static and spherically symmetric vacuum solutions, called Brans solutions, do not reduce to the Schwarzschild metric, the only solution of General Relativity

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13

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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14

Shaker, Jomaa K. M. A. "Algebraic computing in general relativity and supergravity : space-time embeddings and higher dimensional theories." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37849.

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15

Canonico, Rosangela. "Exact solutions in general relativity and alternative theories of gravity: mathematical and physical properties." Doctoral thesis, Universita degli studi di Salerno, 2011. http://hdl.handle.net/10556/181.

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2009 - 2010<br>In this thesis, we discuss several subjects connected with the framework of GR, in order to characterize astrophysical compact objects. The main purpose is to provide simple models describing gravitational fields generated by isolated compact bodies in stationary rotation with extremely simple internal structure, such as neutron stars. The main tools used for our analysis are exact solutions of Einstein fields equations, which have been approached in different ways. In particular, we use the formalism of junction conditions for finding new solutions of Einstein equations in p

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16

Vlasov, Igor. "Reference frames and equations of motion in the first PPN approximation of scaler-tensor and vector-tensor theories of gravity." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4372.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file viewed on (Mar. 1, 2007). Vita. Includes bibliographical references.

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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

McCarvill, Martin Francis Emmett. "Linguistic relativity, interpretive empathy, and the "connection of ideas" : eighteenth-century theories of linguacultural development." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45301.

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This thesis looks at theories of the emergence of linguistic difference put forward by three philosophers of the (long) eighteenth century—Gottfried Wilhelm Leibniz (1646–1716), Étienne Bonnot de Condillac (1715–1780), and Johann Gottfried Herder (1744–1803). The conventional, and in most regards accurate, assessment of these figures places them in different traditions (respectively rationalist, empiricist, romantic); however, I argue, on the matter of the growth and diversification of natural languages, they operate to a nontrivial extent on common ground, unified by a view of language as 1)

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19

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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20

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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21

Gussn, Nasser M. N. 1968. "On the bondgraphic power postulate and its role in interpreting the 1905 and 1915 relativity theories." Thesis, The University of Arizona, 1994. http://hdl.handle.net/10150/558235.

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22

Mohapi, Neo. "A study of spherical solutions in chameleon scalar-tensor theories." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1013315.

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The equivalence principle has proven to be central to theories of gravity, with General Relativity being the simplest and most elegant theory to embody the principle. Most alternative theories of gravity struggle to satisfy the principle and still be distinct from GR. Extensions of cosmological and quantum theories question the irrefutably of the equivalence at every scale. The possibility of an equivalence principle violation at galactic scales would be an exciting prospect. In this thesis, we will carefully examine the equivalence principle through the study of chameleon scalar-tensor theori

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23

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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24

Bebronne, Michael. "Theoretical and phenomenological aspects of theories with massive gravitons." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210253.

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Depuis sa formulation au début du 20ème siècle, la théorie de la Relativité Générale a été vérifiée avec une précision sans cesse croissante. Cette théorie prédit, entre autre, l'existence d'ondes gravitationnelles qui restent à ce jour inobservées, et ce malgré de nombreuses tentatives de détections. Ces ondes sont caractérisées par leur absence de masse. Une des questions qui se pose alors est de savoir si cette absence de masse est une condition nécessaire pour que théorie et observations concordent. Pour répondre à cette question, il est indispensable d'étudier les différents aspects des t

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25

Papallo, Giuseppe. "Causality and the initial value problem in Modified Gravity." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/277416.

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Lovelock and Horndeski theories are natural generalisations of Einstein’s theory of General Relativity. They find applications in Astrophysics, Cosmology and String Theory. This dissertation discusses some issues regarding the mathematical consistency of these theories. In the first part of the thesis we study the Shapiro time delay for gravitons in spherically symmetric spacetimes in Einstein–Gauss–Bonnet gravity (a Lovelock theory). In Lovelock theories, gravitons can propagate faster or slower than light. We show that, thanks to this property, it is possible for them to experience a negativ

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Feix, Martin. "Extragalactic and cosmological tests of gravity theories with additional scalar or vector fields." Thesis, University of St Andrews, 2011. http://hdl.handle.net/10023/1901.

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Despite the many successes of the current standard model of cosmology on the largest physical scales, it relies on two phenomenologically motivated constituents, cold dark matter and dark energy, which account for approximately 95% of the energy-matter content of the universe. From a more fundamental point of view, however, the introduction of a dark energy (DE) component is theoretically challenging and extremely fine-tuned, despite the many proposals for its dynamics. On the other hand, the concept of cold dark matter (CDM) also suffers from several issues such as the lack of direct experime

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27

Büyükbeşe, Tuğba. "Asymptotic safety of gauge theories and gravity : adventures in large group dimensions." Thesis, University of Sussex, 2018. http://sro.sussex.ac.uk/id/eprint/72702/.

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Quantum field theories are considered fundamental provided they remain well-defined and predictive up to highest energies. Important such examples are known as asymptotic freedom and asymptotic safety where the high energy behaviour is controlled by a free or interacting fixed point under the renormalisation group, respectively. The focus of this thesis is the prospect of asymptotic safety for gauge theories and gravity. We are particularly interested in regimes where asymptotic safety arises at parametrically small coupling such as in large-N limits, where N relates to the degrees of freedom.

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28

Mizuno, Ryousuke. "Violation of Weak Cosmic Censorship in a Gravitational Dust Collapse." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225401.

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29

Ranquet, André. "Sur certaines propriétés de l'Energie Noire." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20201.

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Les résultats des observations cosmologiques réalisées à la charnière du siècle (SN1A, CMB, BAO) montrent que contrairement aux prévisions du modèle standard, l'expansion de l'Univers est actuellement en train de s'accélérer. Pour rendre compte de ce phénomène, un composant inconnu dénommé "énergie noire" (Dark Energy) a été introduit soit directement comme un fluide de pression négative, soit indirectement en modifiant la Relativité générale. Après avoir présenté le cadre général de la description de l'Univers, ainsi que le modèle cosmologique standard actuellement accepté, la présente thèse

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Kim, Yunho. "Quadratic Gravity with Black Holes and Gravitational Waves." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/26707.

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This thesis investigates black holes and gravitational waves in the framework of quadratic gravity. These subjects are introduced by first examining the current state of general relativity and how it is realised. The discussion then addresses the quantitative aspects of black holes, gravitational waves, and quadratic gravity. This is then followed by the exploration of the three main research topics. The first research topic investigates the induced charging of a black hole due to a topological term in quadratic gravity. The second research topic focuses on the approximate analytic non-Schwar

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Lévy, Hugo. "Towards well-posed and versatile numerical solutions of scalar-tensor theories of gravity with screening mechanisms : applications at sub-Solar system scales." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP119.

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Les théories tenseur-scalaires de la gravité font partie des alternatives à la Relativité Générale les plus convaincantes, résilientes, et riches en termes de phénoménologie. Les modèles encore viables aujourd'hui reposent sur des mécanismes d'écrantage afin d'être compatibles avec les tests locaux de la gravité, tout en conservant une certaine pertinence physique. La recherche de ces champs scalaires hypothétiques dépend alors de notre capacité à concevoir des expériences adaptées à leur phénoménologie. Hélas, cette tâche est grandement entravée par la difficulté de modéliser suffisamment pré

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Dias, Rafael Guolo. "Formulações alternativas da relatividade geral: da geometrodinâmica à estrutura de Gauge de Ashtekar-Barbero." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/76/76131/tde-29082011-102242/.

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Desenvolvemos aqui um estudo das formulações alternativas-equivalentes da Relatividade Geral, baseada no formalismo de conexões de Ashtekar. Iniciamos discutindo a estrutura matemática necessária de fibrados e conexões, e a teoria de sistemas Hamiltonianos vinculados. Em seguida, damos uma breve introdução ao formalismo métrico de Einstein e então passamos ao formalismo geometrodinâmico canônico (formalismo ADM). Introduzimos as transformações no espaço de fase que geram as formulações alternativas, de forma generalizada tal que possamos obter ambas as variáveis complexas de Ashtekar ou as var

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33

McManus, Ryan. "Testing gravity in the local universe." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33214.

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General relativity (GR) has stood as the most accurate description of gravity for the last 100 years, weathering a barrage of rigorous tests. However, attempts to derive GR from a more fundamental theory or to capture further physical principles at high energies has led to a vast number of alternative gravity theories. The individual examination of each gravity theory is infeasible and as such a systematic method of examining modified gravity theories is a necessity. Studying generic classes of gravity theories allows for general statements about observables to be made independent of explicit

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McPhail, Jeff (Jeffrey Alfred) Carleton University Dissertation Mathematics and Statistics. "Variational methods in general relativity and the positive energy theorems." Ottawa, 1996.

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Rizzuti, Bruno Ferreira. "Análise clássica e quântica de sistemas com simetrias locais e suas aplicações." Universidade Federal de Juiz de Fora (UFJF), 2012. https://repositorio.ufjf.br/jspui/handle/ufjf/4288.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-04-26T17:48:21Z No. of bitstreams: 1 brunoferreirarizzuti.pdf: 507162 bytes, checksum: 6ccfc7f9025a41c3c8bc647f63d413ea (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-13T12:04:02Z (GMT) No. of bitstreams: 1 brunoferreirarizzuti.pdf: 507162 bytes, checksum: 6ccfc7f9025a41c3c8bc647f63d413ea (MD5)<br>Made available in DSpace on 2017-05-13T12:04:02Z (GMT). No. of bitstreams: 1 brunoferreirarizzuti.pdf: 507162 bytes, checksum: 6ccfc7f9025a41c3c8bc647f63d413ea (MD5) Previous issue

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Evers, Hendrik Willem Adriaan. "Subjectivist theories of normative language." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:44df12c0-01ed-4675-9b79-0dabc15cd84a.

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On the assumption that there are no objective normative facts, what is the best theory of normative language? I try to answer this question. Chapter 1 argues for a presumption against noncognitivism and explains why error-theories are of limited interest: they concern adverbs and adjectives like ‘moral’, but not words like ‘ought’, ‘good’ and ‘reason’. This narrows down the options: the best subjectivist theory of normative language is a truth conditional, non-error-theoretic account. Chapter 2 argues for contextualism about normative statements. Contextualists hold that their truth conditions

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Arnault, Pablo. "Discrete-time quantum walks and gauge theories." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066135/document.

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Un ordinateur quantique (OQ), i.e. utilisant les ressources de la physique Q, superposition et intrication, pourrait fournir un gain exponentiel de temps de calcul. Une simulation utilisant ces ressources est appelée simulation Q (SQ). L’avantage des SQs sur les simulations classiques est bien établi au niveau théorique, i.e. software. Leur avantage pratique requiert un hardware Q. L’OQ, sous-entendu universel (cf. plus bas), n’a pas encore vu le jour, mais les efforts en ce sens sont croissants et variés. Aussi la SQ a-t-elle déjà été illustrée par de nombreuses expériences de principe, grâce

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Bigdely, Hadi. "Subgroup theorems in relatively hyperbolic groups and small- cancellation theory." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=119606.

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In the first part, we study amalgams of relatively hyperbolic groups and also therelatively quasiconvex subgroups of such amalgams. We prove relative hyperbolicityfor a group that splits as a finite graph of relatively hyperbolic groups with parabolicedge groups; this generalizes a result proved independently by Dahmani, Osin andAlibegovic. More generally, we prove a combination theorem for a group that splitsas a finite graph of relatively hyperbolic groups with total, almost malnormal andrelative quasiconvex edge groups. Moreover, we provide a criterion for detectingquasiconvexity of subgrou

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Pissondes, Jean-Claude. "Des invariants quadratiques aux invariants projectifs, covariance d'echelle en theorie de la relativite d'echelle." Paris 6, 1998. http://www.theses.fr/1998PA066292.

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Les resultats presentes dans cette these ont pour point de depart la theorie de la relativite d'echelle, pour finalement concerner les transformations projectives complexes, ainsi que la geometrie non-commutative par certains aspects. En premier lieu, j'analyse la prescription formelle selon laquelle il serait possible de deduire des equations de la mecanique classique, des equations qui soient covariantes d'echelle, et par suite, les equations de mecanique quantique. Cette prescription consiste a remplacer dans les equations classiques, les derivees totales par une derivee covariante d'echell

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Walter, Scott. "Hermann minkowski et la mathematisation de la theorie de la relativite restreinte, 1905-1915." Paris 7, 1996. http://www.theses.fr/1996PA070108.

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Le role des mathematiciens dans la decouverte, la reception scientifique, et le developpement de la theorie de la relativite restreinte est aborde sous l'angle des contributions de hermann minkowski. L'effet produit par l'intervention de minkowski s'interprete comme une expansion de la frontiere disciplinaire des mathematiques ; en effet, minkowski a ouvert la porte de la physique relativiste aux mathematiciens. L'interpretation s'appuie sur l'analyse bibliometrique des publications en langues europeennes, ou le fait de publier sur la theorie de la relativite restreinte est mis en rapport avec

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Karim, Yacin. "Vers une vérification expérimentale de la théorie de la relativité restreinte : réplication des expériences de Charles-Eugène Guye (1907-1921)." Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00839315.

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Nous nous intéressons dans cette thèse à un aspect assez peu documenté de l'histoire de la théorie de la relativité restreinte, la recherche d'une vérification expérimentale de ses prédictions sur la variation de l'inertie en fonction de leur vitesse. Nous complétons les études historiques antérieures sur les expériences de Kaufmann (1906) et de Bucherer (1908), et montrons que la vérification de la formule de Lorentz-Einstein constitue encore un enjeu expérimental après 1911. Nous étudions plus particulièrement les recherches dirigées par Charles-Eugène Guye en collaboration avec ses étudiant

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Priou, Denis. "Theorie de l'elasticite en relativite generale et applications a l'etude de la croute solide des etoiles a neutrons." Paris 11, 1992. http://www.theses.fr/1992PA112009.

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La theorie relativiste de l'elasticite construite par carter et quintana est appliquee a l'etude de la croute solide d'une etoile a neutrons en rotation rapide, dans le contexte de la relativite generale. Une configuration non-perturbee de l'etoile est definie; cette configuration est telle que la vitesse angulaire de l'etoile est supposee uniforme. Les equations du mouvement sont posees pour celle-ci. L'etoile est alors perturbee de la facon la plus generale, et les equations regissant toutes les perturbations (stationnaires et dynamiques) de la croute solide de l'etoile a neutrons sont ecrit

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Ashley, Michael John Siew Leung, and ashley@gravity psu edu. "Singularity theorems and the abstract boundary construction." The Australian National University. Faculty of Science, 2002. http://thesis.anu.edu.au./public/adt-ANU20050209.165310.

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The abstract boundary construction of Scott and Szekeres has proven a practical classification scheme for boundary points of pseudo-Riemannian manifolds. It has also proved its utility in problems associated with the re-embedding of exact solutions containing directional singularities in space-time. Moreover it provides a model for singularities in space-time - essential singularities. However the literature has been devoid of abstract boundary results which have results of direct physical applicability.¶ This thesis presents several theorems on the existence of essential singularities in spa

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Mornas, Lysiane. "Proprietes de transport de la matiere dense relativiste et etude de quelques problemes theoriques." Chambéry, 1992. http://www.theses.fr/1992CHAMS005.

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Le travail presente est une contribution a l'etude des proprietes dynamiques de la matiere soumise a des conditions extremes de densite et/ou de temperature, telles que les effets quantiques ni les effets relativistes ne puissent etre negliges. De telles conditions se rencontrent aussi bien dans les collisions d'ions lourds, que dans diverses situations astrophysiques, comme par exemple l'interieur des etoiles a neutrons. Le formalisme employe pour ce faire est celui de la theorie cinetique relativiste quantique. Les proprietes du systeme etudie (courant baryonique, tenseur energie impulsion)

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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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Daude, Thierry. "Sur la theorie de la diffusion pour des champs de Dirac dans divers espaces-temps de la relativite generale." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2004. http://tel.archives-ouvertes.fr/tel-00011974.

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Les résultats présentés dans cette thèse concernent l'étude de la<br />théorie de la diffusion pour des champs de Dirac dans plusieurs<br />espaces-temps de la relativité générale. Les méthodes complètement<br />dépendantes du temps développées par Enss, Sigal, Soffer, Graf,<br />Derezi\'nski et Gérard constituent le fil conducteur de ce<br />travail. Ces méthodes sont basées sur des estimations de propagation<br />comme les estimations de vitesse minimale (obtenues par une théorie de<br />Mourre) qui correspondent à une version faible du principe de Huygens <br />et sur l'étude d'observables

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Bergstedt, Viktor. "Spacetime as a Hamiltonian Orbit and Geroch's Theorem on the Existence of Fermions." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-432488.

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Over a century since its inception, general relativity continues to lie at the heart of some of the most researched topics in theoretical physics. It seems likely that the coveted solutions to problems like quantum gravity are to be found in an extension of general relativity, one which may only be visible in an alternate formulation of the theory. In this thesis we consider the possibility of casting general relativity in the form of an initial value problem where spacetime is seen as the evolution of space. This evolution is shown to be constrained and of Hamiltonian type. Not all spacetim

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Huth, Brian R. "MODELS, PERSPECTIVES, AND SCIENTIFIC REALISM: ON RONALD GIERE’S PERSPECTIVAL REALISM." Kent State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=kent1397572435.

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Bardoux, Yannis. "Trous noirs dans des théories modifiées de la gravitation." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00737357.

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L'intérêt majeur des travaux exposés dans cette thèse est d'explorer la chevelure des trous noirs dans des cadres plus généraux que celui de la Relativité Générale en tenant compte de la présence d'une constante cosmologique, de dimensions supplémentaires, de champs de matière exotiques ou de termes de courbure de rang plus élevé. Ces extensions de la Relativité Générale peuvent s'inscrire dans le cadre de la théorie des cordes. C'est en étudiant des extensions naturelles de la Relativité Générale que nous pouvons aussi mieux comprendre la théorie d'Einstein. Dans un premier temps, nous expose

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Nguyen, The-Cang. "Construction de solutions pour les équations de contraintes en relativité générale et remarques sur le théorème de la masse positive." Thesis, Tours, 2015. http://www.theses.fr/2015TOUR4028/document.

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Dans cette thèse nous étudions deux problèmes issus de la relativité générale : la construction de données initiales pour le problème de Cauchy des équations d’Einstein et le théorème de la masse positive. Nous construisons tout d’abord des données initiales en utilisant la méthode dite conforme introduite par Lichnerowicz [Lichnerowicz, 1944], Y. Choquet-Bruhat–J. York [Choquet-Bruhat et York, 1980] et Y. Choquet-Bruhat–J. Isenberg– D. Pollack [Choquet-Bruhat et al., 2007a]. Plus particulièrement, nous étudions les équations –de contrainte conforme– qui apparaissent dans cette méthode sur des

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