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Dissertations / Theses on the topic 'Noncommutative quantum field theory, gauge theory'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

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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2

Kailasvuori, Janik. "Quasiparticles in the Quantum Hall Effect." Doctoral thesis, Stockholm : Department of Physics, Stockholm University, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-1250.

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3

Alcántara, Bode Julio, and J. Yngvason. "Algebraic quantum field theory and noncommutative moment problems I." Pontificia Universidad Católica del Perú, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/96072.

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4

Andreassen, Anders Johan. "Gauge Dependence of the Quantum Field Theory Effective Potential." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23120.

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Using the absolute stability requirement of the Standard Model vacuum, we compute the Higgs mass bound for the 1-loop Standard Model effective potential with gauge dependence in the $R_\xi$ gauges together with 3-loop beta functions, 3-loop anomalous dimension and 2-loop threshold corrections. We find that the bound changes by +0.1GeV when we change the gauge parameter $\xi$ from 0 to 50. We also report that the Higgs bound plateaus as we increase $\xi$ beyond 100.

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5

Schenkel, Alexander [Verfasser], and Thorsten [Akademischer Betreuer] Ohl. "Noncommutative Gravity and Quantum Field Theory on Noncommutative Curved Spacetimes / Alexander Schenkel. Betreuer: Thorsten Ohl." Würzburg : Universitätsbibliothek der Universität Würzburg, 2011. http://d-nb.info/1016615094/34.

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6

Troost, Jan. "Strings, links between conformal field theory, gauge theory and gravity." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2009. http://tel.archives-ouvertes.fr/tel-00410720.

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La théorie de cordes unifie de façon naturelle les théories de jauge, qui décrivent les interactions entre les particules élémentaires, avec une théorie quantique de la gravitation. Ces dernières années ont apporté de grands progrès dans la compréhension des états non-perturbatifs de la théorie, ses aspects holographiques, ainsi que la construction de modèles proches du Modèle Standard. Néanmoins, il reste des défis pour la théorie de cordes, qui incluent une définition non-perturbative, une meilleure compréhension de l'holographie, et le problème de la constante cosmologique. Ma recherche s'e

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7

Gatti, Antonio. "A gauge invariant flow equation." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268629.

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8

Kizilersü, Ayşe. "Gauge theory constraints on the fermion-boson vertex." Thesis, Durham University, 1995. http://etheses.dur.ac.uk/4886/.

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In this thesis we investigate the role played by fundamental properties of QED in determining the non-perturbative fermion-boson vertex. These key features are gauge invariance and multiplicative renormalisability. We use the Schwinger-Dyson equations as the non- perturbative tool to study the general structure of the fermion-boson vertex in QED. These equations, being an infinite set, have to be truncated if they are to be solved. Such a truncation is made possible by choosing a suitable non-perturbative ansatz for the fermion-boson vertex. This choice must satisfy these key properties of gau

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9

Rondelli, Andrea. "Functional methods in quantum field theory." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15839/.

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Iniziamo introducendo l'integrazione su manifold di Hilbert, tramite l'approssimazione dello spazio tangente alla varietà. Passiamo poi a descrivere due tecniche per regolarizzare integrali funzionali o di cammino quadratici (che presentano un laplaciano nell'azione): la regolarizzazione e rinormalizzazione tramite zeta function e il cutoff nel tempo proprio. Cerchiamo di confrontare i due diversi risultati (finiti) così ottenuti. Sussessivamente applichiamo l'integrazione funzionale agli integrali di cammino usando il formalismo della quantizzazione in qp-simboli ottenendo così un'ampiezza di

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10

Burgess, Mark. "Gauge vacua on multiply connected spacetimes." Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293575.

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11

Hahn, Atle. "Chern-Simons theory on R³ in axial gauge." Bonn : Rheinische Friedrich-Wilhelms-Universität, Mathematisches Institut, 2001. http://catalog.hathitrust.org/api/volumes/oclc/52314497.html.

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12

Flachi, Antonino. "Quantum field theory on brane backgrounds." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366586.

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13

Ball, R. D. "The effective action : Covariance and chirality." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373651.

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14

Cofano, Marco. "Quantum field theory of (p,0)-forms on kaehler manifolds." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/5632/.

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In questa tesi abbiamo studiato la quantizzazione di una teoria di gauge di forme differenziali su spazi complessi dotati di una metrica di Kaehler. La particolarità di queste teorie risiede nel fatto che esse presentano invarianze di gauge riducibili, in altre parole non indipendenti tra loro. L'invarianza sotto trasformazioni di gauge rappresenta uno dei pilastri della moderna comprensione del mondo fisico. La caratteristica principale di tali teorie è che non tutte le variabili sono effettivamente presenti nella dinamica e alcune risultano essere ausiliarie. Il motivo per cui si preferisce

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15

Probst, Jonas. "Applications of the gauge/gravity duality." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:970c6e71-371f-442f-94c9-8f1fffc8a4f7.

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This thesis investigates applications of the gauge/gravity duality to strongly coupled quantum field theories. After a review of the duality and of correlators and transport in quantum systems, we present our results on second-order non-conformal hydrodynamics. We derive new Kubo formulae for five second-order transport coefficients in non-conformal relativistic fluids. We then apply these Kubo formulae to a class of non-conformal holographic fluids at infinite coupling. We find strong evidence that the Haack-Yarom identity, known to relate second-order coefficients in conformal holographic fl

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16

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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17

Clark, Adam Benjamin. "Applications of conformal perturbation theory to novel geometries in the gauge/gravity correspondence /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/9789.

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18

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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19

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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20

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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21

Ludwig, Thomas. "Wick Rotation for Quantum Field Theories on Degenerate Moyal Space." Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-118795.

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In dieser Arbeit wird die analytische Fortsetzung von Quantenfeldtheorien auf dem nichtkommutativen Euklidischen Moyal-Raum mit kommutativer Zeit zu entsprechenden Moyal-Minkowski Raumzeit (Wick Rotation) erarbeitet. Dabei sind diese Moyal-Räume durch eine konstante Nichtkommutativiät gegeben. Einerseits wird die Wick Rotation im Kontext der algebraischen Quantenfeldtheorie, ausgehend von einer Arbeit von Schlingemann, hergeleitet. Von einem Netz Euklidischer Observablen wird die Lorentz’sche Theorie durch alle Bilder der fortgesetzten Poincare Gruppenwirkung auf der Zeit-Null Schicht erhalten

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22

Bufalo, Rodrigo Santos [UNESP]. "Modelo de Thirring com simetria de Gauge: uma análise funcional." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/138376.

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Made available in DSpace on 2016-05-17T16:51:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-02-29. Added 1 bitstream(s) on 2016-05-17T16:54:19Z : No. of bitstreams: 1 000854751.pdf: 487882 bytes, checksum: e24c35b8b127fa21adc89d3fb6ba1a67 (MD5)<br>Realizamos um estudo da Teoria Quântica de Campos num espaço-tempo de (1 + 1)-dimensões em modelos exatamente solúveis via o formalismo de integração funcional; em que a estrutura Hamiltoniana dos modelos é construída segundo a abordagem de Dirac para sistemas vinculados. Além disso, implementamos as equações de Schwinger-Dyson e as iden

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23

Bufalo, Rodrigo Santos. "Modelo de Thirring com simetria de Gauge: uma análise funcional /." São Paulo, 2008. http://hdl.handle.net/11449/138376.

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Orientador: Bruto Max Pimentel Escobar<br>Coorientador: Rodolfo Alván Casana Sifuentes<br>Banca: Abraham Hirsz Zimerman<br>Banca: Veríssimo Manoel de Aquino<br>Resumo: Realizamos um estudo da Teoria Quântica de Campos num espaço-tempo de (1 + 1)-dimensões em modelos exatamente solúveis via o formalismo de integração funcional; em que a estrutura Hamiltoniana dos modelos é construída segundo a abordagem de Dirac para sistemas vinculados. Além disso, implementamos as equações de Schwinger-Dyson e as identidades de Ward-Takahashi. Damos ênfase na estrutura de gauge do modelo de Thirring com simet

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24

Bouatta, Nazim. "String field theory, non-commutativity and higher spins." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210481.

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In Chapter 1, we give an introduction to the topic of open string field theory. The concepts presented include gauge invariance, tachyon condensation, as well as the star product.<p>In Chapter 2, we give a brief review of vacuum string field theory (VSFT), an approach to open string field theory around the stable vacuum of the tachyon. We discuss the sliver state explaining its role as projector in the space of half-string basis. We review the construction of D-brane solutions in vacuum string field theory. We show that in the sliver basis the star product correspond to a matrix product. <p>Us

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25

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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26

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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27

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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28

O'Bannon, Andrew Hill. "Holographic thermodynamics and transport of flavor fields /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/9785.

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29

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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30

Poulain, Timothé. "On the quantum structure of spacetime and its relation to the quantum theory of fields : k-Poincaré invariant field theories and other examples." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS331/document.

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De nombreuses approches à la gravité quantique suggèrent que la description usuelle de l’espace-temps ne serait pas adaptée à la description des phénomènes physiques impliquant à la fois des processus gravitationnels et quantiques. Une meilleure description pourrait consister à munir l’espace-temps d’une structure non-commutative en remplaçant les coordonnées locales sur la variété par des opérateurs ne commutant pas deux-à-deux. Il s’ensuit que le comportement des théories de champs construites sur de tels espaces diffère en général de celui des théories de champs ordinaires. L’étude de ces p

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31

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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32

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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33

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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34

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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35

Brito, Luiz Cleber Tavares de. "Estudo da teoria de Chern-Simons não-comutativa acoplada à matéria." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-07032014-142438/.

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Consideramos modelos não-comutativos de campos escalares e fermiônicos acoplados com um campo de Chern-Simons em 2+ 1 dimensões e mostramos que, pelo menos em um laço, o modelo contendo somente um campo fermiônico, na representação fundamental, minimalmente acoplado ao campo de Chern-Simons, é consistente no sentido que não há divergências infravermelhas não-integráveis presentes no modelo. Contrariamente, divergências infravermelhas perigosas ocorrem se o campo fermiônico pertence à representação adjunta ou se consideramos o acoplamento com a matéria escalar. A formulação do modelo de Chern-S

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36

Nikoofard, Vahid. "Some considerations about field theories in commutative and noncommutative spaces." Universidade Federal de Juiz de Fora (UFJF), 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/3057.

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Katona, Gregory. "Field Theoretic Lagrangian From Off-Shell Supermultiplet Gauge Quotients." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5958.

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Recent efforts to classify off-shell representations of supersymmetry without a central charge have focused upon directed, supermultiplet graphs of hypercubic topology known as Adinkras. These encodings of Super Poincare algebras, depict every generator of a chosen supersymmetry as a node-pair transformtion between fermionic / bosonic component fields. This research thesis is a culmination of investigating novel diagrammatic sums of gauge quotients by supersymmetric images of other Adinkras, and the correlated building of field theoretic worldline Lagrangians to accommodate both classical and

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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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Rodrigues, Alexandre Guimarães. "O Modelo CPN-1 Não-Comutativo em (2+1)D." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-21062012-160558/.

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Nesta tese estudamos possíveis extensões do modelo CPN-1 em (2+1) dimensões. Provamos que quando tomado na representação fundamental à esquerda ele é renormalizável e não possui divergências infravermelhas perigosas. O mesmo não ocorre se o campo principal . Mostramos que a inclusão de férmions, minimamente acoplados ao campo de calibre, traz alguma melhoria no comportamento das divergências infravermelhas no setor de calibre em ordem dominante em 1/N. Discutimos também a invariância de calibre no procedimento de renormalização.<br>In this thesis investigate possible extensions of the (2+1) di

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40

Lehum, André Carlos. "Quebra de simetria de calibre no modelo de Chern-Simons supersimétrico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-09052008-102010/.

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Através do formalismo de supercampos, estudamos as propriedades ultravioletas da eletrodinâmica quântica supersimétrica no espaço-tempo tridimensional. Mostramos que esta teoria é finita em todas as ordens de perturbação num calibre particular. Também apresentamos uma análise perturbativa do modelo de Chern-Simons supersimétrico acoplado a um supercampo escalar complexo. Com isso, estudamos a quebra da simetria de calibre U(1) e calculamos as primeiras correções quânticas à ação efetiva na fase quebrada. Mostramos que a renormalização da equação de gap é suficiente para assegurar a renormaliza

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41

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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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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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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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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Lima, Leonardo de. "Novos modelos na escala TeV para a hierarquia de Gauge e das massas dos férmions." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-29092014-232004/.

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O Modelo Padrão (MP) da física de partículas fornece uma descrição extremamente bem sucedida de todos os dados experimentais atuais. No entanto, temos razões para esperar que ele não seja válido até escalas de energia arbitrariamente altas. No MP a massa do bóson de Higgs é quadraticamente sensível a correções radiativas, sofrendo de grandes problemas de ajuste fino. Isso gera o chamado problema da hierarquia de gauge, cuja solução natural requer nova física na escala TeV. O MP também não fornece nenhuma explicação para a grande hierarquia de massas e ângulos de mistura dos férmions. Os proble

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Seyedi, Shila Seyedi. "QFT and Spontaneous Symmetry Breaking." Thesis, Uppsala universitet, Teoretisk fysik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425891.

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The aim of this project is to understand the structure of the Standard Model of the particle physics. Therefore quantum field theories (QFT) are studied in the both cases of abelian and non-abelian gauge theories i.e. quantum electrodynamics (QED), quantum chromodynamics (QCD) and electroweak interaction are reviewed. The solution to the mass problem arising in these theories i.e. spontaneous symmetry breaking is also studied.<br>Syftet med detta projekt är att förstå strukturen för partikelfysikens standardmodell. Därför studeras kvantfältsteorier (QFT) i båda fallen av abelska och ic

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Barranco, López Alejandro. "Applications of Supersymmetry: Exact Results, Gauge/Gravity Duality and Condensed Matter." Doctoral thesis, Universitat de Barcelona, 2014. http://hdl.handle.net/10803/284195.

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The study of supersymmetry has led us to a better understanding of field theories, specially in the strong coupling regime. In this thesis we have tried to show this through several examples. These are: - The first of these examples has been the application of localization techniques in supersymmetric theories. Specifically, we have used the partition function of N=2 supersymmetric Chern-Simons theory with gauge group U(N) and 2Nf flavors. To regularize the theory, it is necessary to make the computation in a three sphere whose radius, R, serves as an IR regulator which can be taken to infi

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Nunes, Yves Eduardo Chifarelli de Oliveira. "Modelo de estudo do mecanismo de Gribov através de operadores locais compostos." Universidade do Estado do Rio de Janeiro, 2011. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6437.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico<br>O objetivo desta dissertação é apresentar uma conexão entre a condição de Gribov-Zwanziger para o gap de massa e o mecanismo de quebra espontânea de simetria, através do estudo de um operador composto introduzido numa maneira localizada. Para tornar esta relação mais clara, um modelo é apresentado e alguns aspectos quânticos são discutidos.<br>The aim of this work is to present a connection between the Gribov-Zwanziger condition for the mass gap and the spontaneous symmetry breaking mechanism, by studying a composite operator int

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Filho, Fernando Teixeira da Silva. "Estudo do modelo CPN-1em (2+1)D não comutativo supersimétrico com o campo básico na representação fundamental." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-17122007-122342/.

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Nesta tese estudamos o modelo CP^(N-1) em (2+1) dimensões do espaco-tempo, onde o campo básico está na representacão fundamental. Diferentemente do caso em que o campo básico está na representacão adjunta, já estudado na literatura, o modelo por nós estudado se reduz ao modelo supersimétrico usual no limite comutativo. Analisamos a estrutura de fase e calculamos as correcões dominantes e subdominantes na expansão 1/N. Provamos que a teoria é livre de singularidades infravermelhas não integráveis e é renormalizável na ordem dominante. A funcão de vértice de dois pontos do campo básico é calcula

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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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