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Dissertations / Theses on the topic 'Gauge field theories'

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Published: 4 June 2021

Last updated: 9 February 2022

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1

Stephenson, David Brian. "Non-perturbative field theories." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/13009.

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2

Berman, David Simon. "Chiral gauge theories and their applications." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/5041/.

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This thesis is concerned with so called chiral gauge theories, also known as self dual gauge theories. In particular, the aim of this thesis to investigate the role that chiral gauge theories play in duality symmetries in lower dimensions through dimensional reduction. Chapter one serves as an introduction to the notions of duality in field and string theory. The problems of formulating well defined actions for self-dual gauge theories are introduced as well as a brief presentation of the different approaches used to over come these problems. Chapter two introduces dimensional reduction and de

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3

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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4

Donaire, Manuel. "Formation of topological defects in gauge field theories." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613012.

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5

Davies, N. Michael. "Semiclassical monopole calculations in supersymmetric gauge theories." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4360/.

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We investigate semiclassical contributions to correlation functions in N = 1 supersymmetric gauge theories. Our principal example is the gluino condensate, which signals the breaking of chiral symmetry, and should be exactly calculable, according to a persymmetric non-renormalisation theorem. However, the two calculational approaches previously employed, SCI and WCI methods, yield different values of the gluino condensate. We describe work undertaken to resolve this discrepancy, involving a new type of calculation in which the space is changed from R(^4) to the cylinder R(3) x S(1) This brings

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6

Seiler, Werner Markus. "Analysis and application of the formal theory of partial differential equations." Thesis, Lancaster University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.238979.

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7

Cnockaert, Sandrine. "Higher spin gauge field theories: aspects of dualities and interactions." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210849.

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Cette thèse s'inscrit dans le cadre de la physique mathématique des interactions fondamentales. Elle porte sur l'étude des théories de champs qui décrivent les particules élémentaires. En particulier, les théories de champs de spin élevé (plus grand ou égal à 2) sont analysées. Mis à part pour le graviton, vecteur supposé des interactions gravitationnelles, il n'y a aucun indice que ces champs soient présents dans la nature. Cependant leur existence n'est pas impossible théoriquemement et ils interviennent dans la théorie des cordes, candidate pour une théorie quantique d'unification de toutes

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8

McNeill, Daniel Owen. "Strong coupling aspects of (2+1) dimensional gauge field theories." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244631.

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9

Clague, David Edward. "Dynamical symmetry breaking by a top quark condensate in the standard model." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293372.

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10

Tigg, Jason. "Nonperturbative techniques and the operator product expansion in studies of dynamically broken chiral symmetry." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359504.

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11

Nicholls, Jennifer Ann. "Optimization and the convergence of perturbation series." Thesis, Durham University, 1990. http://etheses.dur.ac.uk/6148/.

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This thesis is concerned with the possible sums of perturbation series in mass- less, renormalizable field theories. It shows that, given a free choice of scheme, the limit of the sequence of approximants is arbitrary. Restricting the choice to finite schemes, in particular "zero schemes", yields a perturbatively unique limit to the sequence of approximants. An operational method for calculating perturbative expansions in the class of zero schemes is discussed. A comparison of various optimization schemes is given for a few phenomenological examples in QCD and QED.

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12

Lau, Richard. "SO(N) gauge theories in 2+1 dimensions." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:fa9dae0a-70c2-467a-8aa7-daff5531ff10.

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We calculate the string tensions, mass spectrum, and deconfining temperatures of <i>SO(N</i>) gauge theories in 2+1 dimensions. After a review of lattice field theory, we describe how we simulate the corresponding lattice gauge theories, construct operators to project on to specific states, and extrapolate values to the continuum limit. We discuss how to avoid possible complications such as finite size corrections and the bulk transition. <i>SO(N</i>) gauge theories have become recently topical since they do not have a fermion sign problem, are orbifold equivalent to <i>SU(N</i>) gauge theorie

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13

Corrado, Richard Anthony. "Some aspects of the connection between field theories and gravity /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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14

Söderberg, Alexander. "Renormalization in Field Theories." Thesis, Uppsala universitet, Teoretisk fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-251561.

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Several different approaches to renormalization are studied. The Callan-Symanzik equation is derived and we study its beta functions. An effective potential for the Coleman-Weinberg model is studied to find that the beta function is positive and that spontaneous symmetry breaking will occur if we expand around the classical field. Lastly we renormalize a non-abelian gaugetheory to find that the beta function in QCD is negative.

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15

Campbell-Smith, Adrian. "Infrared physics of U(1) gauge field theories in three dimensions." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312244.

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16

Spill, Fabian. "Yangians in integrable field theories, spin chains and gauge-string dualities." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6128.

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In the following dissertation, we explore the applicability of Yangian symmetry to various integrable models, in particular, in relation with S-matrices. One of the main themes in this dissertation is that, after a careful study of the mathematics of the symmetry algebras one finds that in an integrable model, one can directly reconstruct S-matrices just from the algebra. It has been known for a long time that S-matrices in integrable models are fixed by symmetry. However, Lie algebra symmetry, the Yang-Baxter equation, crossing and unitarity, which are what constrains the S-matrix in integrab

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17

van, Anders Greg. "Aspects of SU(2|4) symmetric field theories and the Lin-Maldacena geometries." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/933.

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Gauge/gravity duality is an important tool for learning about strongly coupled gauge theories. This thesis explores a set of examples of this duality in which the field theories have SU(2|4) supersymmetry and discrete sets of vacuum solutions. Specifically, we use the duality to propose Lagrangian definitions of type IIA Little String Theory on S⁵ as double-scaling limits of the Plane-Wave Matrix Model, maximally supersymmetric Yang-Mills theory on R x S² and N=4 supersymmetric Yang-Mills theory on R×S³/Zk. We find the supergravity solutions dual to generic vacua of the Plane-Wave Matrix Model

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18

Grosse, Harald, Thomas Krajewski, Raimar Wulkenhaar, and grosse@doppler thp univie ac at. "Renormalization of Noncommutative Yang-Mills Theories: A Simple Example." ESI preprints, 2000. ftp://ftp.esi.ac.at/pub/Preprints/esi914.ps.

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19

Lambrou, Eliana. "Phase structure of five-dimensional anisotropic lattice gauge theories." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19579.

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The idea that we live in a higher-dimensional space was first introduced almost 100 years ago. In the past two decades many extra-dimensional models have been proposed in order to solve fundamental problems of nature such as the hierarchy problem. Most of them need exploration via non-perturbative approaches and Lattice Gauge Theory provides a tool for doing this. In this thesis, we make attempts to find a non-perturbative way to localize gauge fields that arise from five-dimensional SU(2) gauge theories on 3-branes. In 1984, it was proposed that the phase diagram of anisotropic extra-dimensio

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20

Wens, Vincent. "Of N=1 supersymmetric gauge theories and localization." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210272.

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In this thesis, we study certain non-perturbative aspects of N=1 gauge theories. We show how to compute the expectation values of chiral operators (i.e. those that preserve the anti-chiral supercharges) exactly from a first-principle approach based on the path integral over the microscopic fields. <p><p>The text is divided into two parts. The first one consists of an original introduction to the tools that underlie the researches and results obtained during this thesis. After a general introduction, we present some methods to obtain exact results. Covered topics include instantons, N=2 supersy

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21

Sars, Matthias Christiaan Bernhard. "Parametric representation of Feynman amplitudes in gauge theories." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17302.

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In dieser Arbeit wird eine systematische Methode gegeben um die Amplituden in (skalarer) Quantenelektrodynamik und nicht-Abelsche Eichtheorien in Schwinger-parametrische Form zu schreiben. Dies wird erreicht in dem der Zähler der Feynmanregeln im Impulsraum in einem Differentialoperator umgewandelt wird. Dieser Differentialoperator wirkt dann auf den parametrichen Integranden der skalaren Theorie. Für die QED ist das am einfachsten, weil die Leibnizregel hier nicht nötig ist. Im Fall der sQED und den nicht-Abelsche Eichtheorien stehen die Beiträge der Leibnizregel in Verbindung mit 4-valente

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22

Loureiro, Bruno. "Disorder in holographic field theories : inhomogeneous geometries, momentum relaxation and SYK models." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277911.

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Holographic dualities are now an established tool in the study of universal properties of strongly coupled field theories. Yet, theories without translational symmetry are still poorly understood in this context. In this dissertation, we investigate three new approaches to this challenging problem. The first part of the dissertation concerns a class of phenomenological holographic models in which momentum relaxation can be achieved without breaking translational symmetry in the dual geometry. In particular, we focus on an example in which the dual geometry is similar to anti-de Sitter (AdS) Br

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23

Brown, William Elvis. "The development of non-perturbative methods for supersymmetric and non-supersymmetric quantum field theories." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244546.

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24

Harley, Mark Stuart. "Multiparton webs in non-abelian gauge theories at three loops and beyond." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/19562.

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Amplitudes in theories with a massless gauge boson suffer from so-called infrared divergences where off-shell states become asymptotically close to the mass-shell in loop or phase-space momentum integrals. These singularities have been shown to cancel intricately order-by-order in the perturbative expansion. However, in order to obtain meaningful and precise predictions for physical observables, we must understand and compute such divergences to high orders. This can be accomplished by calculating webs: weighted sets of Feynman diagrams which, when exponentiated give the complete infrared sing

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25

Waelkens, Andries Jozef Nicolaas. "Calculation of webs in non-Abelian gauge theories using unitarity cuts." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/28757.

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When calculating scattering processes in theories involving massless gauge bosons, such as gluons in Quantum Chromodynamics (QCD), one encounters infrared (IR), or soft, divergences. To obtain precise predictions, it is important to have exact expressions for these IR divergences, which are present in any on-shell scattering amplitude. Due to their long wavelength, soft gluons factorise with respect to short-distance, or hard, interactions and can be captured by correlators of semi-infinite Wilson lines. The latter obey a renormalisation group equation, which gives rise to exponentiation. The

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26

Nolland, David John. "Quantum field theories with fermions in the Schrödinger representation." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4410/.

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This thesis is concerned with the Schrödinger representation of quantum field theory. We describe techniques for solving the Schrödinger equation which supplement the standard techniques of field theory. Our aim is to develop these to the point where they can readily be used to address problems of current interest. To this end, we study realistic models such as gauge theories coupled to dynamical fermions. For maximal generality we consider particles of all physical spins, in various dimensions, and eventually, curved spacetimes. We begin by considering Gaussian fields, and proceed to a detail

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27

Slizovskiy, Sergey. "Yang-Mills Theory in Gauge-Invariant Variables and Geometric Formulation of Quantum Field Theories." Doctoral thesis, Uppsala universitet, Teoretisk fysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-129670.

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In Part I we are dealing with effective description of Yang-Mills theories based on gauge-invarint variables. For pure Yang-Mills we study the spin-charge separation varibles. The dynamics in these variables resembles the Skyrme-Faddeev model. Thus the spin-charge separation is an important intermediate step between the fundamental Yang-Mills theory and the low-energy effective models, used to model the low-energy dynamics of gluons. Similar methods may be useful for describing the Electroweak sector of the Standard Model in terms of gauge-invariant field variables called supercurrents. We stu

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28

Rubiera, García Diego. "Relativistic lagrangian non-linear field theories supporting non-topological soliton solutions." Doctoral thesis, Universidad de Oviedo, 2008. http://hdl.handle.net/10803/11131.

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En el contexto de la teoría de campos el interés en soluciones extendidas describiendo campos asociados a partículas puntuales data de los años 30, con los intentos de Born e Infeld para construir una electrodinámica no-lineal cuyas soluciones electrostáticas a simetría esférica eliminaran la divergencia de la autoenergía del electrón en Electrodinámica Clásica.En esta tesis realizamos un amplio estudio de una extensa clase de teorías relativistas de campos que contienen soluciones de tipo solitón no-topológico en tres dimensiones espaciales. Específicamente estudiamos campos (multi) escalares

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29

Garolera, Huguet Blai. "Probing gauge theories: Exact results and holographic computations." Doctoral thesis, Universitat de Barcelona, 2015. http://hdl.handle.net/10803/289346.

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The holographic duality between gauge theories and string theories has opened a new door to access the strongly coupled regime of quantum field theories and offers, at the same time, a completely new way to understand the elusive nature of quantum gravity and the non-perturbative regime of string theory. After almost two decades of research, the current status of the correspondence is that of a solid conjecture that has passed a great number of nontrivial tests, to the point that it is generally believed to be true. The present thesis includes a collection of four pap

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30

Nedelin, Anton. "Exact Results in Five-Dimensional Gauge Theories : On Supersymmetry, Localization and Matrix Models." Doctoral thesis, Uppsala universitet, Teoretisk fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-243320.

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Gauge theories are one of the corner stones of modern theoretical physics. They describe the nature of all fundamental interactions and have been applied in multiple branches of physics. The most challenging problem of gauge theories, which has not been solved yet, is their strong coupling dynamics. A class of gauge theories that admits simplifications allowing to deal with the strong coupling regime are supersymmetric ones. For example, recently proposed method of supersymmetric localization allows to reduce expectation values of supersymmetric observables, expressed through the path integral

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31

Torokoff, Kristel. "Field Theories and Vortices with Nontrivial Geometry." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Universitetsbiblioteket [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-6744.

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32

Schuster, Theodor. "Scattering amplitudes in four- and six-dimensional gauge theories." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2014. http://dx.doi.org/10.18452/17034.

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Streuamplituden der Quantenchromodynamik (QCD), N = 4 Super-Yang-Mills-Theorie (SYM-Theorie) und der sechsdimensionalen N = (1, 1) SYM-Theorie werden untersucht, mit einem Fokus auf die Symmetrien und Relationen zwischen den Streuamplituden dieser Eichtheorien auf dem Baum-Niveau. Die Baum-Niveau- und Ein-Schleifen-Farbzerlegung beliebiger QCD-Amplituden in primitive Amplituden wird bestimmt und Identitäten hergeleitet, welche den Nullraum unter den primitiven Amplituden aufspannen. Anschließend wird bewiesen, dass alle farbgeordneten Baum-Niveau-Amplituden der masselosen QCD aus der N = 4 SYM

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33

Nolte, Detlef Reinhard. "Topics in high energy physics : from supersymmetric gauge field theories to rare B meson decays /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9974117.

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34

Lotito, Matteo. "Geometric classification of 4d rank-1 N=2 superconformal field theories." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1530880263562131.

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35

Volkholz, Jan. "Nonperturbative studies of quantum field theories on noncommutative spaces." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2007. http://dx.doi.org/10.18452/15712.

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Diese Arbeit befasst sich mit Quantenfeldtheorien auf nicht-kommutativen Räumen. Solche Modelle treten im Zusammenhang mit der Stringtheorie und mit der Quantengravitation auf. Ihre nicht-störungstheoretische Behandlung ist üblicherweise schwierig. Hier untersuchen wir jedoch drei nicht-kommutative Quantenfeldtheorien nicht-perturbativ, indem wir die Wirkungsfunktionale in eine äquivalente Matrixformulierung übersetzen. In der Matrixdarstellung kann die jeweilige Theorie dann numerisch behandelt werden. Als erstes betrachten wir ein regularisiertes skalares Modell auf der nicht-kommutativ

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36

Carrozza, Sylvain. "Tensorial methods and renormalization in Group Field Theories." Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112147/document.

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Cette thèse présente une étude détaillée de la structure de théories appelées GFT ("Group Field Theory" en anglais),à travers le prisme de la renormalisation. Ce sont des théories des champs issues de divers travaux en gravité quantique, parmi lesquels la gravité quantique à boucles et les modèles de matrices ou de tenseurs. Elles sont interprétées comme desmodèles d'espaces-temps quantiques, dans le sens où elles génèrent des amplitudes de Feynman indexées par des triangulations,qui interpolent les états spatiaux de la gravité quantique à boucles. Afin d'établir ces modèles comme des théories

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37

Marzolla, Andrea. "Symmetry breaking and Goldstone bosons in holographic strongly coupled field theories: Relativistic and non-relativistic examples." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/258338.

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In this thesis various holographic models are treated, which describe theories of fields where an internal symmetry is broken, either in relativistic contexts, or in case of violation of the Lorentz invariance.The first chapter opens with the revision of the notion of symmetry breaking in pure relativistic field theory. The case of spontaneous breaking and the Goldstone theorem are discussed, as well as the case of explicit breaking, where precise Ward identities between conserved current correlators and scalar operators loaded under such current are derived in a completely general way.We then

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38

Francisco, Rafael Rodrigues. "Aspectos de teorias quânticas de gauge a temperatura finita." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29112014-182637/.

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Nós trabalhamos em três problemas relacionados com as teorias de gauge a temperatura finita. O primeiro discute a invariância de gauge da massa física do elétron num espaço de dimensão arbitrária a temperatura zero. Obtivemos a massa física a partir do polo do propagador fermiônico e demonstramos que a maneira usual de definir este propagador funciona para gauges covariantes mas não para gauges não covariantes. Em seguida propusemos um novo propagador e verificamos de duas formas diferentes que a massa física obtida a partir deste funciona para um gauge definido com parâmetros de controle tais

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Ferreira, Miguel Jorge Bernabé. "Teorias de campos discretas e modelos topológicos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-03052012-082048/.

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Neste trabalho estudamos as teorias de gauge puras (sem campo de matéria) na rede em três dimensões. Em especial, estudamos a subclasse das teorias topológicas. A maneira como denimos e tratamos as teorias de gauge e diferente, mas equivalente, à forma usual apresentada em [2, 3]. Definimos estas teorias via o formalismo de Kuperberg, que é um formalismo puramente matemático de um invariante topológico de variedades tridimensionais. Este formalismo, embora bastante abstrato, pode ser adaptado para descrever as classes de modelos das teorias de gauge na rede, e traz várias vantagens, pois possi

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40

Wiegandt, Konstantin [Verfasser], Harald [Akademischer Betreuer] Dorn, Prof Dr Gregory [Akademischer Betreuer] Korchemsky, and Jan [Akademischer Betreuer] Plefka. "Superconformal quantum field theories in string : gauge theory dualities / Konstantin Wiegandt. Gutachter: Harald Dorn ; Prof. Dr. Gregory Korchemsky ; Jan Plefka." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://d-nb.info/1027529372/34.

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Wiegandt, Konstantin [Verfasser], Harald Akademischer Betreuer] Dorn, Prof Dr Gregory [Akademischer Betreuer] Korchemsky, and Jan C. [Akademischer Betreuer] [Plefka. "Superconformal quantum field theories in string : gauge theory dualities / Konstantin Wiegandt. Gutachter: Harald Dorn ; Prof. Dr. Gregory Korchemsky ; Jan Plefka." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://nbn-resolving.de/urn:nbn:de:kobv:11-100205442.

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42

He, Yang-Hui 1975. "On algebraic singularities, finite graphs and D-brane gauge theories : a string theoretic perspective -- with a digression on string field theory." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8490.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.<br>Includes bibliographical references (p. 601-634).<br>In this thesis we shall address certain beautiful inter-relations between the construction of 4-dimensional supersymmetric gauge theories and resolution of algebraic singularities, from the perspective of String Theory. We review in detail the requisite background in both the mathematics, such as orbifolds, symplectic quotients and quiver representations, as well as the physics, such as gauged linear sigma models, geometrical engineering, Hanany-Witten setups a

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43

Soares, Bruno Learth. "Simetrias globais e locais em teorias de calibre." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/45/45132/tde-26022008-144335/.

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Este trabalho aborda a formulação geométrica das teorias clássicas de calibre, ou Yang-Mills, considerando-as como uma importante classe de modelos que deve ser incluída em qualquer tentativa de estabelecer um formalismo matemático geral para a teoria clássica dos campos. Tal formulação deve vir em (pelo menos) duas variantes: a versão hamiltoniana, que passou por uma fase de desenvolvimento rápido durante os últimos 10-15 anos, levando ao que hoje é conhecido como o ``formalismo multissimplético\'\', e a mais tradicional versão lagrangiana utilizada nesta tese. O motivo principal justificando

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44

Broccoli, Matteo. "On the trace anomaly of a Weyl fermion in a gauge background." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16408/.

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In this thesis we study the trace anomaly of a Weyl fermion in an abelian gauge background. We first introduce the topic of anomaly in Quantum Fields Theory and provide case studies of a global and a gauge anomaly. Then, we review the lagrangians of the Weyl fermion and Dirac fermion, the models that are the focus of our chiral and trace anomaly computations. Since we evaluate the anomalies using Pauli-Villars (PV) regularization, we present different PV masses and discuss the classical symmetries they break. We identify the differential operators that enter our regularization schemes and we

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45

Bonin, Carlos Alberto [UNESP]. "A quantização da eletrodinâmica de Podolsky em equilíbrio termodinâmico no formalismo de Matsubara-Fradkin." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/102496.

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Made available in DSpace on 2014-06-11T19:32:09Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-05-27Bitstream added on 2014-06-13T19:42:31Z : No. of bitstreams: 1 bonin_ca_dr_ift.pdf: 929334 bytes, checksum: 60c2fbe31fa5aed0296db910275586ca (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Nesta tese estudaremos a eletrodinâmica quântica de Podolsky em equilíbrio termodinâmico no formalismo de Matsubara-Fradkin. Uma vez que a eletrodinâmica de Podolsky é uma teoria de gauge, quantizar-la-emos com o método do campo auxiliar de Nakanishi, que é uma técnic

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Gaset, Rifà Jordi. "A multisymplectic approach to gravitational theories." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620740.

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The theories of gravity are one of the most important topics in theoretical physics and mathematical physics nowadays. The classical formulation of gravity uses the Hilbert-Einstein Lagrangian, which is a singular second-order Lagrangian; hence it requires a geometric theory for second-order field theories which leads to several difficulties. Another standard formulation is the Einstein-Palatini or Metric-Affine, which uses a singular first order Lagrangian. Much work has been done with the aim of establishing the suitable geometrical structures for describing classical field theories. In

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Bonin, Carlos Alberto. "A quantização da eletrodinâmica de Podolsky em equilíbrio termodinâmico no formalismo de Matsubara-Fradkin /." São Paulo : [s.n.], 2011. http://hdl.handle.net/11449/102496.

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Orientador: Bruto Max Pimental Escobar<br>Banca: Dionísio Bazeia<br>Banca: Ademir Santana<br>Banca: Dmitry Gitman<br>Banca: Josif Frenkel<br>Resumo: Nesta tese estudaremos a eletrodinâmica quântica de Podolsky em equilíbrio termodinâmico no formalismo de Matsubara-Fradkin. Uma vez que a eletrodinâmica de Podolsky é uma teoria de gauge, quantizar-la-emos com o método do campo auxiliar de Nakanishi, que é uma técnica invariante de Lorentz. Mostraremos que no caso do campo de Podolsky livre uma correção à lei de Stefan-Boltzmann é esperada e utilizaremos dados da radiação cósmica de fundo em micr

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Zhao, Peng. "Integrability in supersymmetric gauge theories." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648125.

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Davison, Richard A. "Excitations in holographic quantum liquids." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:3b1db914-709e-41ec-ba7c-c968cb87b752.

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In this thesis we review the gauge/gravity duality and how it can be used to compute the thermodynamic properties and low-energy excitations of holographic quantum liquids - strongly-interacting field theories with a non-zero density of matter. We then study in detail the charge density excitations of two such liquids, the D3/D7 theory and the RN-AdS₄ theory, by computing the poles of their charge density Green's functions, and their charge density spectral functions. Although it is not a Landau Fermi liquid, the charge density excitations of the D3/D7 theory display many of the same propertie

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La, Cock Pierre. "Introduction to lattice gauge theories." Master's thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/17085.

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Includes bibliographical references.<br>The thesis is organized as follows. Part I is a general introduction to LGT. The theory is discussed from first principles, so that for the interested reader no previous knowledge is required, although it is assumed that he/she will be familiar with the rudiments of relativistic quantum mechanics. Part II is a review of QCD on the lattice at finite temperature and density. Monte Carlo results and analytical methods are discussed. An attempt has been made to include most relevant data up to the end of 1987, and to update some earlier reviews existing on t

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