Relevant bibliographies by topics / Vacuum String Field Theory / Dissertations / Theses
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Dissertations / Theses on the topic 'Vacuum String Field Theory'

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Published: 14 March 2023

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1

Teraguchi, Shunsuke. "Vacuum String Field Theory in the Oscillator Formalism." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/147806.

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2

Barns-Graham, Alexander Edward. "Much ado about nothing : the superconformal index and Hilbert series of three dimensional N =4 vacua." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/287950.

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We study a quantum mechanical $\sigma$-model whose target space is a hyperKähler cone. As shown by Singleton, [184], such a theory has superconformal invariance under the algebra $\mathfrak{osp}(4^*|4)$. One can formally define a superconformal index that counts the short representations of the algebra. When the hyperKähler cone has a projective symplectic resolution, we define a regularised superconformal index. The index is defined as the equivariant Hirzebruch index of the Dolbeault cohomology of the resolution, hereafter referred to as the index. In many cases, the index can be explicitl
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3

Muenster, Korbinian. "String field theory." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-160964.

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This thesis discusses several aspects of string field theory. The first issue is bosonic open-closed string field theory and its associated algebraic structure -- the quantum open-closed homotopy algebra. We describe the quantum open-closed homotopy algebra in the framework of homotopy involutive Lie bialgebras, as a morphism from the loop homotopy Lie algebra of closed string to the involutive Lie bialgebra on the Hochschild complex of open strings. The formulation of the classical/quantum open-closed homotopy algebra in terms of a morphism from the closed string algebra to the open string Ho
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4

Ali, T. "String theory and conformal field theory." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595446.

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In this thesis we consider some aspects of two dimensional Conformal Field Theory and their connection to String Theory. We have also studied some aspects of supersymmetry of M-Theory on Ricci-flat seven manifolds with 4-form fluxes. We concentrate mainly on certain supersymmetric extensions of the coset models due to Goddard, Kent and Olive (GKO). These models are known as the Kazama-Suzuki (KS) models and they are characterized by their <i>N</i> = 2 superconformal symmetry. Two series of the KS models enjoy a duality called level-rank duality which can be described roughly as duality between
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5

NICOLOSI, MARCO. "Issues on tadpoles and vacuum redefinitions in String Theory." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2006. http://hdl.handle.net/2108/232.

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“Issues on tadpoles and vacuum redefinitions in String Theory” Marco Nicolosi Questa Tesi di dottorato è dedicata al problema dei “tadpoles” di NS-NS, funzioni ad un punto di campi bosonici assorbiti dal vuoto che tipicamente emergono nella Teoria delle Stringhe in seguito alla rottura della supersimmetria. Queste teorie contengono campi bosonici in due settori, quello di NS-NS e quello di R-R. Mentre i “tadpoles” di R-R tipicamente segnalano un’inconsistenza, come la presenza di anomalie quantistiche nel caso di spazi interni compatti, e quindi in generale devono essere cancellati,
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6

Uhlmann, Sebastian. "String field theory methods and solutions /." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969730179.

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7

Sigalov, Ilya. "D-branes and string field theory." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/39560.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.<br>Includes bibliographical references (p. 115-127).<br>In this thesis we study the D-brane physics in the context of Witten's cubic string field theory. We compute first few terms the low energy effective action for the non-abelian gauge field A, from Witten's action. We show that after the appropriate field redefinition which relates the string field theory variables to the worldsheet variables one obtains the correct Born-Infeld terms. We then compute the rolling tachyon solution in the context of string field t
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8

Moeller, Nicolas 1975. "Tachyon condensation in string field theory." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29613.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.<br>Includes bibliographical references (p. 185-197).<br>In this thesis, we present some results that strongly support Sen's conjectures on tachyon condensation on a bosonic D-brane. Our main tool of analysis is level truncated open bosonic string field theory We use level truncation to check that the energy difference between the local maximum and the local minimum of the open bosonic tachyon effective potential is equal to the tension of a space-filling D-brane (Sen's first conjecture). Our results prove this equa
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9

Yang, Haitang Ph D. Massachusetts Institute of Technology. "String field theory and tachyon dynamics." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36814.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2006.<br>Includes bibliographical references (p. 77-81).<br>In this thesis we present some works done during my doctoral studies. These results focus on two directions. The first one is motivated by tachyon dynamics in open string theory. We calculate the stress tensors for the p-adic string model and for the pure tachyonic sector of open string field theory (OSFT). We give the energy density of lump solutions and attempt to evaluate the evolution of the pressure in rolling tachyon solutions. We discuss the relevance of
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10

Ellwood, Ian Thomas 1977. "String field theory and tachyon condensation." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29455.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.<br>Includes bibliographical references (p. 133-142).<br>In this thesis I discuss various aspects of Witten's cubic string field theory. After a brief review of the basics of string field theory we begin by showing how string field theory can be used to check certain conjectures about the tachyon vacuum. We then discuss the problem of trying to globally gauge fix string field theory. We end with a discussion of various results in the quantization of the theory.<br>by Ian Thomas Ellwood.<br>Ph.D.
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11

Halter, Sebastian. "Inflation from field theory and string theory perspectives." Diss., Ludwig-Maximilians-Universität München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-156269.

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12

Bedford, James Andrew Peter. "On perturbative field theory and twistor string theory." Thesis, Queen Mary, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479158.

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13

Lake, Matthew James. "Cosmic necklaces in string theory and field theory." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/523.

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In this thesis we investigate astrophysical phenomena which arise in models with compact extra dimensions, focussing on the cosmological consequences of strings which wrap cycles in the internal space. Embedding our strings in the Klebanov-Strassler geometry we develop a concrete model of cosmic necklaces and investigate the formation of primordial black holes and dark matter relics from necklace collapse. Using data from the EGRET cosmic ray experiment, we place bounds on the parameters which de ne the warped deformed conifold, including the value of the warp factor and the radius of the comp
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14

Feng, Bo 1971. "D-branes, gauge theory and string field theory." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8491.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002.<br>Includes bibliographical references (p. 245-262).<br>In this thesis, we present several works done in last three years. They include three directions in the string theory. In the first direction, we use the brane setup to find mirror pairs of SO(n) and Sp(k) gauge groups for N = 4 three-dimensional gauge field theories. To reach this result, we analyze carefully the s-configuration and predict a nontrivial string dynamics, i.e., the splitting of branes on the orientifold planes. In the second direction, we develo
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15

Karch, Andreas. "Field Theory Dynamics from branes in String Theory." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1998. http://dx.doi.org/10.18452/14371.

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Nach jahrelanger Suche hat sich bis heute Stringtheorie als einziger Kandidat einer konsistenten Quantentheorie der Gravitation herauskristallisiert. Um aus der Stringtheorie präzise Vorhersagen für unsere Niederenergiewelt zu gewinnen, ist es notwendig, das Vakuumproblem zu lösen, das heißt einen Mechanismus zu finden, der aufzeigt, in welchem Stringvakuum wir leben und warum die Natur dieses ausgewählt hat. Die Beantwortung dieser Frage benötigt nicht-perturbative Informationen.Diese wurden erst in jüngster Zeit zugänglich. Eine besondere Rolle in dieser Entwicklung spielten die sogenannten
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16

Abdurrahman, A. "On the half-string formulation of Witten's string field theory." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293375.

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17

Longton, Matheson Edward. "Marginal deformations and open string field theory." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54593.

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The study of solutions to open string field theory remains very much a work in progress, even for the bosonic string. In this dissertation I consider in detail two of these solutions involving marginal deformations of the original boundary conformal field theory. The first is a previously unknown solution in which two D-branes are translated before tachyon condensation occurs. This solution is studied in the level truncation scheme, in a sector which is larger than the universal subspace, but still less than the whole string Fock space due to several symmetries of the theory which take on a di
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18

Dearnaley, Roger. "Some topics in covariant string field theory." Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357737.

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19

Kiermaier, Michael Stefan. "Analytic progress in open string field theory." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/53227.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 179-185).<br>Open string field theory provides an action functional for open string fields, and it is thus a manifestly off-shell formulation of open string theory. The solutions to the equation of motion of open string field theory are expected to describe consistent classical open string backgrounds. In this thesis, I present a number of analytic results in bosonic open string field theory. Firstly, I present analytic solutions to
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20

Lawrence, Adrian Michael. "Topics in string theory and cosmology." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279663.

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21

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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22

Krishnan, Ranganathan. "Spaces of conformal theories and string field theory." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28061.

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23

Ilderton, Anton. "String field theory : time evolution and T-duality." Thesis, Durham University, 2005. http://etheses.dur.ac.uk/2395/.

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The time evolution operator of quantum field theory (Schrödinger functional) can be written in terms of particles moving on S(^1)/Z(_2-). By deriving the 'gluing property’ which joins two propagators across fixed time surfaces, we show that the Feynman diagram expansion of the free Schrödinger functional is determined once we know the field propagator. We generalise the gluing property to a new method of sewing string field propagators and construct the string field Schrödinger functional in terms of strings moving on S(^1)/Z(_2-). Timelike T-duality in string theory then appears as a large/sm
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24

Brunner, Ilka. "On the Interplay between String and Field Theory." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 1998. http://dx.doi.org/10.18452/14367.

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Die physikalischen Kräfte in der Natur werden durch zwei fundamentale Theorien be- schrieben: Das Standard Modell der Elementarteilchenphysik kann die Wechselwirkun- gen zwischen Elementarteilchen, also die Physik auf mikroskopischer Skala, erklären. Das Gegenstück ist die allgemeine Relativitätstheorie, die die Physik auf makrokopischen, kosmologischen Skalen widergibt. Eine fundamentale Frage an die theoretische Physik ist es, diese beiden Theorien zu vereinigen. String Theorie ist ein Kandidat für eine solche vereinheitlichende Theorie. In den letzten Jahren wurden große Fortschritte
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25

Casali, Eduardo. "Worldsheet methods for perturbative quantum field theory." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/265833.

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This thesis is divided into two parts. The first part concerns the study of the ambitwistor string and the scattering equations, while the second concerns the interplay of the symmetries of the asymptotic null boundary of Minkowski space, called [scri], and scattering amplitudes. The first part begins with a review of the CHY formulas for scattering amplitudes, the scattering equations and the ambitwistor string including its pure spinor version. Next are the results of this thesis concerning these topics, they are: generalizing the ambitwistor model to higher genus surfaces; calculating the o
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26

Gómez, Valent Adrià. "Vacuum Energy in Quantum Field Theory and Cosmology." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/459249.

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The cosmological constant appearing in Einstein’s equations is a key element of the ΛCDM standard cosmological model. This term performs, effectively, as pure vacuum energy, and is considered the easiest explanation of the positive acceleration of the current Universe. But despite the successes of the concordance model in explaining a large variety of high precision data, some tensions are also present at the observational level, and there are also some important problems arising on the theoretical side. The most severe one is the so-called “cosmological constant problem”, which is caused by t
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27

Sieg, Christoph. "Aspects of noncommutativity and holography in field theory and string theory." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974396095.

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28

Sieg, Christoph. "Aspects of noncommutativity and holography in field theory and string theory." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2005. http://dx.doi.org/10.18452/15214.

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Die Arbeit beschäftigt sich mit zwei Themen: den nichtkommutativen Yang-Mills-Theorien und der AdS/CFT-Korrespondenz. Im ersten Teil wird eine teilweise Aufsummation der theta-entwickelten Störungstheorie untersucht. Letztere stellt einen Weg dar, nichtkommutative Yang-Mills-Theorien mit beliebigen Eichgruppen G als Störungsentwicklung im Nichtkommutativitätsparameter theta zu definieren. Es wird gezeigt, daß man im Fall, daß G eine echte Untergruppe von U(N) ist, die ungleich einer U(M) ist (M<br>This thesis addresses two topics: noncommutative Yang-Mills theories and the AdS/CF
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29

Wang, Yifan Ph D. Massachusetts Institute of Technology. "Lessons on interacting quantum field theories from string theory." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/106452.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 185-194).<br>In this thesis, we use string theory constructions and dualities to explore various features of interacting quantum field theories. We begin with an overview in Chapter 1, of past and recent developments in quantum field theories, explaining the advantages of string theoretic techniques over traditional approaches in answering a range of questions about interacting dynamics. In Chapter 2 we study the holographic
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30

Rahman, Sabbir Ahmed 1971. "High genus moduli spaces in closed string field theory." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/42752.

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31

Malek, Emanuel. "Duality invariant formulations of string and M-theory." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708518.

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32

Wiegandt, Konstantin. "Superconformal quantum field theories in string." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2012. http://dx.doi.org/10.18452/16605.

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In dieser Dissertation werden Aspekte von superkonformen Quantenfeldtheorien untersucht, die für die sogenannte AdS/CFT Korrespondenz relevant sind. Die AdS/CFT Korrespondenz beschreibt eine Dualität zwischen Stringtheorien im Anti-de Sitter Raum und superkonformen Quantenfeldtheorien im Minkowskiraum. In diesem Kontext wurde die sog. Wilsonschleifen / Amplituden Dualität entdeckt, die die Übereinstimmung von n-Gluon MHV Amplituden und n-seitigen polygonalen Wilsonschleifen in der N=4 supersymmetrischen Yang-Mills (SYM) Theorie beschreibt. Im ersten Teil dieser Dissertation wird die Wilsonsch
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33

Ruszczycki, Blazej. "Target Space Duality with Dilaton and Tachyon Field." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_dissertations/17.

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We study the target space duality of classical two dimensional sigma models. The models with dilaton and tachyon field are analyzed. As a motivating example the historical electric-magnetic duality is presented. We review the construction of the duality transformation and the integrability conditions for the nonlinear sigma models with target spaces described by general metrics and antisymmetric two-forms. We generalize the formalism for the models whose actions contain the dilaton and tachyon field. For the dilaton field case it is required that the duality is a property solely of the target
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34

Forini, Valentina. "Non trivial string backgrounds: Tachyons in String Field Theory and Plane-waves in DLCQ Strings." Doctoral thesis, Università degli studi di Trento, 2006. https://hdl.handle.net/11572/368486.

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One of the most interesting problems in string theory is to understand how the background space-time on which the string propagates arises in a self-consistent way. For open strings, there are two main approaches to this problem, boundary string field theory (BSFT) and cubic string field theory (CSFT). In the first part of this Thesis we deal with the construction of the spacetime tachyon effective action in BSFT. Renormalization fixed points are solutions of classical equations of motion and should be viewed as solutions of classical string field theory. We have constructed the Witten-Shata
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35

Franzmann, Guilherme. "Application of open string field theory to the inflationary scenario /." São Paulo, 2014. http://hdl.handle.net/11449/108901.

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Orientador: Nathan Jacob Berkovits<br>Banca: Horatiu Stefan Nastase<br>Banca: Luis Raul Weber Abramo<br>Resumo: Esta tese consiste em uma revisão da estrutura da Teoria de Campo na Corda, focando nas propriedades clássicas do setor da corda aberta e suas possíveis aplicações para inflação. Portanto, seguiremos a prescrição do Witten e construiremos uma ação para a Teoria de Campo na Corda Aberta Bosônica. Então, percebendo que a teoria tem uma modo taquiônico e motivado pelo cenário de inflação, calcularemos e consideraremos o potencial taquiônico em alguma ordem de aproximação. Como aplicação,
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36

Kyritisis, Konstantinos. "Locality and causality properties of light cone string field theory." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3028/.

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The recent discovery of a new maximally supersymmetric background for the type IIB superstring theory has revived the interest in light cone string field theory. This background is a plane wave background with the additional support of a non- trivial self dual Ramond-Ramond 5-form field strength. It can be quantised in the light cone gauge and hence it naturally fits into the framework of light cone string field theory. In this thesis we re-examine the causality and locality properties of string theory in the flat background and compare it with the recent results for string theory in this plan
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37

Anton, Fernando. "Half-string oscillator approach to closed string field theory and superconformal minimal models on the torus." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335904.

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38

McCloud, Paul James. "Symmetry in classical and quantum field theory : an application of the theory of jets." Thesis, King's College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.321679.

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39

Hampton, Shaun David. "Understanding Black Hole Formation in String Theory." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531949063908224.

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40

Coletti, Erasmo. "Low energy effective actions and tachyon dynamics from string field theory." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32300.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2005.<br>Includes bibliographical references (p. 133-144).<br>In this thesis we show how to calculate off-shell low energy effective actions and how to study the dynamics of the tachyon from string field theory. We discuss how to obtain an effective action for the massless field and we explain how to relate it to well known results. We then study the tachyon dynamics both in cubic and in boundary string field theory.<br>by Erasmo Coletti.<br>Ph.D.
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Wurtz, Albrecht. "Conformal Field Theory and D-branes." Doctoral thesis, Karlstad University, Faculty of Technology and Science, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-1346.

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<p>The main topic of this doctoral thesis is D-branes in string theory, expressed in the language of conformal field theory. The purpose of string theory is to describe the elementary particles and the fundamental interactions of nature, including gravitation as a quantum theory. String theory has not yet reached the status to make falsifiable predictions, thus it is not certain that string theory has any direct relevance to physics. On the other hand, string theory related research has led to progress in mathematics.</p><p>We begin with a short introduction to conformal field theory and some
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Rudolph, Felix J. "Duality covariant solutions in extended field theories." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/23614.

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Double field theory and exceptional field theory are formulations of supergravity that make certain dualities manifest symmetries of the action. To achieve this, the geometry is extended by including dual coordinates corresponding to winding modes of the fundamental objects. This geometrically unifies the spacetime metric and the gauge fields (and their local symmetries) in a generalized geometry. Solutions to these extended field theories take the simple form of waves and monopoles in the extended space. From a supergravity point of view they appear as 1/2 BPS objects such as the string, the membr
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Singh, P. "A spin coefficient approach to vacuum quadratic Poincaré gauge field theory." Thesis, Loughborough University, 1990. https://dspace.lboro.ac.uk/2134/13760.

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The field equations of the vacuum Quadratic Poincare Gauge Field Theory are expressed in the spin coefficient formalism of Newman and Penrose. These equations are differential identities involving the curvature and torsion, and in this NewmanPenrose type approach must be combined with the generalized Newman-Penrose identities given in chapter 4. The use of this Newman-Penrose type formalism is demonstrated in the derivation of several new classes of exact solutions which would have been impossible to obtain by the various methods being used at this moment in time. This therefore demonstrates t
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Khatun, Zohora. "On string and W-strings." Thesis, Queen Mary, University of London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297181.

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King, Nicholas T. "T-Duality and Double Field Theory." VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4643.

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The purpose of this thesis is to study a symmetry of string theory known as T-duality. We focus on a particular example establishing the equivalence between a quantized string moving in a circular space of radius R and a dual string moving in a similar space of radius 1/R . We will show that this duality implies that the momentum of the string in one picture becomes the number of times the string is wound around the circle in the dual picture. We present two proofs of T-duality. The first reflects the standard interpretation of T-duality as an isomorphism of quantum theories. The second approa
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46

Baguet, Arnaud. "Exceptional Field Theory and Supergravity." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN022/document.

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Dans cette thèse, nous présentons des avancements récents en Théorie des Champs Doubles (TCD) et Théories des Champs Exceptionnels (TCE). Ces théories ont la particularité d’être des reformulations de supergravité dans lesquelles les symétries de dualité sont explicites avant toute réduction dimensionnelle. Ces reformulations se basent sur la définition d’un espace-temps étendu qui géométrise le groupe de T-dualité en TCD et les groupes exceptionnels de U-dualité en TCE. Tous les champs de cet espace sont soumis à une contrainte de section qui restreint leur dépendance en coordonnées. Il exist
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47

Neves, Rui Gomes Mendona. "Conformal field theories on random surfaces and the non-critical string." Thesis, Durham University, 1997. http://etheses.dur.ac.uk/4750/.

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Recently, it has become increasingly clear that boundaries play a significant role in the understanding of the non-perturbative phase of the dynamics of strings. In this thesis we propose to study the effects of boundaries in non-critical string theory. We thus analyse boundary conformal field theories on random surfaces using the conformal gauge approach of David, Distler and Kawai. The crucial point is the choice of boundary conditions on the Liouville field. We discuss the Weyl anomaly cancellation for Polyakov's non-critical open bosonic string with Neumann, Dirichlet and free boundary con
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48

Belopolsky, Alexander. "The role of tachyons and dilatons in off-shell string field theory." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/32685.

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49

Gevorgyan, Yeva. "Quantisation of the bosonic string." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-12052016-154947/.

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In this work we review the basic principles of the theory of the relativistic bosonic string through the study of the action functionals of Nambu-Goto and Polyakov and the techniques required for their canonical, light-cone, and path-integral quantisation. For this purpose, we briefly review the main properties of the gauge symmetries and conformal field theory involved in the techniques studied.<br>Neste trabalho fazemos uma revisão dos princípios básicos da teoria da corda bosônica relativística através do estudo dos funcionais ação de Nambu-Goto e de Polyakov e das técnicas necessárias para
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50

Colombaro, Ivano. "Dynamical Casimir effect and the structure of vacuum in quantum field theory." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10382/.

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Some of the most interesting phenomena that arise from the developments of the modern physics are surely vacuum fluctuations. They appear in different branches of physics, such as Quantum Field Theory, Cosmology, Condensed Matter Physics, Atomic and Molecular Physics, and also in Mathematical Physics. One of the most important of these vacuum fluctuations, sometimes called "zero-point energy", as well as one of the easiest quantum effect to detect, is the so-called Casimir effect. The purposes of this thesis are: - To propose a simple retarded approach for dynamical Casimir effect, thus a
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