Thèses sur le sujet « Quantum thermal field theory »
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BRAGA, DE GOES E. VASCONCELLOS JOAO. « Thermal equilibrium states in perturbative Algebraic Quantum Field Theory in relation to Thermal Field Theory ». Doctoral thesis, Università degli studi di Genova, 2019. http://hdl.handle.net/11567/979745.
Texte intégralAnglin, J. R. (James Robert). « Influence functionals and thermal effects in quantum field theory ». Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41522.
Texte intégralMillington, Peter William. « Thermal quantum field theory and perturbative non-equilibrium dynamics ». Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/thermal-quantum-field-theory-and-perturbative-nonequilibrium-dynamics(9e2e162f-124c-4f97-9c01-9f585d7aedb4).html.
Texte intégralMetikas, Georgios. « Aspects of thermal field theory with applications to superconductivity ». Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312156.
Texte intégralEltzner, Benjamin. « Local Thermal Equilibrium on Curved Spacetimes and Linear Cosmological Perturbation Theory ». Doctoral thesis, Universitätsbibliothek Leipzig, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-117472.
Texte intégralIn dieser Arbeit wird die von Schlemmer eingeführte Erweiterung des Kriteriums für lokales thermisches Gleichgewicht in Quantenfeldtheorien von Buchholz, Ojima und Roos auf gekrümmte Raumzeiten untersucht. Dabei werden verschiedene Probleme identifiziert und insbesondere die bereits von Schlemmer gezeigte Instabilität unter Zeitentwicklung untersucht. Es wird eine alternative Herangehensweise an lokales thermisches Gleichgewicht in Quantenfeldtheorien auf gekrümmten Raumzeiten vorgestellt und deren Probleme diskutiert. Es wird dann eine Untersuchung des dynamischen Systems der linearen Feld- und Metrikstörungen im üblichen Inflationsmodell mit Blick auf Uneindeutigkeit der Quantisierung durchgeführt. Zuletzt werden die Temperaturfluktuationen der kosmischen Hintergrundstrahlung auf Kompatibilität mit lokalem thermalem Gleichgewicht überprüft
Ferreira, Renan Buosi. « Teorias de calibre à temperatura finita e a equação de Boltzmann ». Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-10112015-091130/.
Texte intégralThe equivalence between the formalism of Boltzmann transport equation and the high temperature limit of thermal field theory is investigated in the context of gauge theories. This connection is made through a direct comparison between the thermal amplitudes obtained via the collisionless transport equation with those resulting from the HTL limit of one loop thermal Greens function. For the quantum formalism we start with an ensemble in equilibrium, whose thermal effects are described by the imaginary time formalism. This allows one to write the thermal Green functions as a statistical average of forward scattering amplitudes (after analytic continuation). For the classical formalism, we combine Wongs equations with the time derivative of the particle distribution function in phase space. The resulting equation can be solved in an iterative fashion, yielding the perturbative results for the current and the respective thermal amplitudes. Finally, comparing the amplitudes obtained from the two formalisms, we were able to verify their equivalence. Moreover, we present explicit calculations for a non-Abelian theory up to the second order approximation, and in the case of an abelian theory we proceed up to fourth order, when the charge distribution is not neutral.
Gonzalez, Yuber Ferney Perez. « Leptogênese e mecanismo de See-Saw de tipo I na teoria quântica de campos fora do equilíbrio térmico ». Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24092014-151403/.
Texte intégralOne of the most important problems that is needed to solve by the Elementary Particle Physics as well as by the Cosmology is the existence of baryonic asymmetry. Among the most attractive scenarios of dynamic generation of baryonic asymmetry (Baryogenesis) is the so-called Leptogenesis. In that scenario, a leptonic asymmetry is treated in such a way that it will be converted in baryonic asymmetry by non-perturbative processes mediated by sphalerons. In the simplest realization of Leptogenesis, that will be studied in this disertation, heavy right-handed neutrinos, produzed thermally, decay violating CP generating a leptonic asymmetry in these decays. The principal attractive of this scenario is that it connects two apparently different scales, the scale of leptonic asymmetry generation and the scale of masses and oscillations of the active neutrinos through the See-Saw mechanism. The usual study of the leptogenesis uses Boltzmann equations in order to determine the temporal evolution of the asymmetry. However, the Boltzmann equation is a semiclassical equations, since, on one side, it is formulated for a classical function in phases space, the distribution function, but, on the other hand, the collision term involves quantities obtained in the Quantum Field Theory at zero temperature. In particular, Boltzmann formulation does not allow to describe quantum phenomena such coherent oscillations and effects of decoherence and interference. Indeed, a proper quantum description of the evolution of the leptonic asymmetry must be obtained in the context of the Non-Equilibrium Quantum Field Theory. The Schwinger-Keldysh formalism allows to perform this. In this dissertation, leptogenesis is described using the Schwinger-Keldysh formalism for the case in which there are three right-handed neutrinos without a definite mass hierarchy.
Salehi, Kasmaei Babak. « NONEQUILIBRIUM PROBES OF THE QUARK-GLUON PLASMA ». Kent State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=kent1627035862984205.
Texte intégralOeckl, Robert. « Quantum geometry and Quantum Field Theory ». Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621912.
Texte intégralGupta, Neha. « Homotopy quantum field theory and quantum groups ». Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/38110/.
Texte intégralPoletti, Stephen John. « Geometry, quantum field theory and quantum cosmology ». Thesis, University of Newcastle Upon Tyne, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315921.
Texte intégralKerr, Steven. « Topological quantum field theory and quantum gravity ». Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14094/.
Texte intégralIvin, Marko. « Topics in quantum field theory ». Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410042.
Texte intégralRussell, I. H. « Calculations in quantum field theory ». Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328134.
Texte intégralRondelli, Andrea. « Functional methods in quantum field theory ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15839/.
Texte intégralat, Andreas Cap@esi ac. « Quantum Field Theory as Dynamical System ». ESI preprints, 2001. ftp://ftp.esi.ac.at/pub/Preprints/esi1055.ps.
Texte intégralMazur, Daniel Paul. « Nonperturbative quantum field theory in astrophysics ». Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43255.
Texte intégralO'Donald, Lewis John. « Twistor diagrams and quantum field theory ». Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306032.
Texte intégralDaniels, D. R. « Quantum field theory near black holes ». Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636346.
Texte intégralCassidy, M. J. « Quantum field theory and acausal spacetimes ». Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597360.
Texte intégralDolan, F. A. « Aspects of superconformal quantum field theory ». Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598582.
Texte intégralEllicott, Paul. « Geometrical aspects of quantum field theory ». Thesis, University of Newcastle Upon Tyne, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329154.
Texte intégralFlachi, 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.
Texte intégralSmith, C. J. « Energy conditions in quantum field theory ». Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434155.
Texte intégralRazzaghe, Ashrafi Babak 1964. « Making and remaking quantum field theory ». Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29762.
Texte intégralIncludes bibliographical references (leaves 139-156).
In this thesis, I examine two episodes in the history of quantum field theory using different research techniques and historiographic approaches. The first episode occurred during the 1920's and 1930's when quantum mechanics and relativity were being reconciled. I present some of the central developments of that episode using an approach that relates questions asked by physicists to the structures of putative natural kinds upon which they predicated their research. The second episode occurred during the 1960's and 1970's when important features of quantum field theory were given new interpretations that arose from the exchange of methods and insights between particle physics, solid state physics, statistical mechanics and physical chemistry. Research for the second episode was conducted in collaboration with other historians and scientists using novel web-based and database-backed research tools.
by Babak Razzaghe Ashrafi.
Ph.D.
Lifschytz, Gilad. « Quantum gravity and topological field theory ». Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/33529.
Texte intégralOlbermann, Heiner. « Quantum field theory via vertex algebras ». Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54994/.
Texte intégral
O'Connell, Donal Wise Mark B. Wise Mark B. « Unusual signs in quantum field theory / ». Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-05242007-141715.
Texte intégralSprickerhof, Jakob. « Causal structures in quantum field theory ». Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/10658/.
Texte intégralDi, Mauro Marco. « Flavor mixing in quantum field theory and quantum information ». Doctoral thesis, Universita degli studi di Salerno, 2011. http://hdl.handle.net/10556/194.
Texte intégralAfter reviewing the formalism for describing flavor mixing, both in Quantum Mechanics and Quantum Field Theory, some consequences along three different directions are studied. First, it is proposed that flavor mixing can be a viable candidate for spontaneous supersymmetry breaking, due to the nontrivial vacuum structure induced by it. After the statement of the conjecture, an explicit proof in a simple case is given. Second, the properties of flavor states as entangled states both in QM and QFT are studied. By interpreting such states as multipartite mode–entangled states, both the correlation content and the decoherence effects are studied. Third, a possible new interpretation of flavor mixing as induced by an external vector field is proposed, and it is shown how this solves some problems of the usual formalism in connection with Lorentz and Poincar´e violation. Some phenomenological consequences of this picture are pointed out, as well as some intriguing physical interpretations. [edited by author]
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Eakins, Jonathan Simon. « Classical and quantum causality in quantum field theory, or, "the quantum universe" ». Thesis, University of Nottingham, 2004. http://eprints.nottingham.ac.uk/10069/.
Texte intégralFarhi, David. « Jets and Metastability in Quantum Mechanics and Quantum Field Theory ». Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718743.
Texte intégralPhysics
Hättich, Frank. « Whitehead's process philosophy and quantum field theory ». [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969348061.
Texte intégralBorris, Markus. « Quantum Field Theory on Non-commutative Spacetimes ». Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-67788.
Texte intégralSchmidt, Robert. « Defects in Higher-Dimensional Quantum Field Theory ». Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-71937.
Texte intégralComeau, Marc A. « Premonoidal *-Categories and Algebraic Quantum Field Theory ». Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22652.
Texte intégralSanders, Jacobus Ambrosius. « Aspects of locally covariant quantum field theory ». Thesis, University of York, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490310.
Texte intégralMitchard, Mark Gavin. « Non-perturbative methods in quantum field theory ». Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315867.
Texte intégralBedingham, Daniel John. « Quantum field theory and Bose Einstein condensation ». Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249588.
Texte intégralKjaergaard, Lars. « Analyticity and scaling in quantum field theory ». Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4249/.
Texte intégralAli, David Benedict. « Aspects of non-Abelian quantum field theory ». Thesis, University of Liverpool, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368626.
Texte intégralYang, Ting-Cheng. « Aspects of gravity in quantum field theory ». Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/50763/.
Texte intégralMonoyios, Michael. « New perturbation expansions for quantum field theory ». Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47573.
Texte intégralTassev, Svetlin Valentinov. « Quantum field theory of scalar cosmological perturbations ». Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32906.
Texte intégralIncludes bibliographical references (leaf 55).
Using canonical quantization we show that the spectrum of the scalar cosmological fluctuations as calculated until now is not correct. We derive the correct expression for the spectrum, and show that our correct treatment alleviates the fine-tuning problem in inflation.
by Svetlin Valentinov Tassev.
S.B.
Jizba, Petr. « Equilibrium and non-equilibrium quantum field theory ». Thesis, University of Cambridge, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624406.
Texte intégralEyink, Gregory Lawrence. « Quantum field-theory in non-integer dimensions / ». The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164091.
Texte intégralCollini, Giovanni. « Fedosov Quantization and Perturbative Quantum Field Theory ». Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-224698.
Texte intégralTeresi, Daniele. « Quantum field theory for the early universe ». Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/quantum-field-theory-for-the-early-universe(050a2a86-9302-4c2d-81da-53f2fb47492a).html.
Texte intégralCasali, Eduardo. « Worldsheet methods for perturbative quantum field theory ». Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/265833.
Texte intégralGargiulo, Maria Vittoria. « On neutrino mixing in Quantum Field Theory ». Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2606.
Texte intégralNeutrino physics is one of the most important areas in research on the fundamental interactions, both theoretically and experimentally. A central issue in the study of these particles is related to the properties of mixing and flavor oscillations. In particular, a necessary condition for the mixing is that neutrinos have mass, a feature which is not considered by the Standard Model, and which poses the problem of the origin and nature of these masses. The theoretical basis of neutrino mixing has been studied in many details and in the late ’90 a quantum field theory (QFT) formalism for mixed fields has been developed thanks to which it was found that mixing transformations induce a condensed structure in the flavour vacum with possible phenomenological consequences. In particular, the usual formulas of Pontecorvo oscillation are arising as the relativistic limit of exact formulas in the context of field theory. Within this framework it is inserted our work, finalized to the study of algebraic properties of the mixing transformations generator in QFT and its components. In quantum mechanics (QM) the mixing transformation looks like a rotation operating on massive neutrino states. We show explicitly that such a rotation is not sufficient for implementing the mixing transformation at level of fields. It is necessary, in fact, also the action of a Bogoliubov transformation which operates a suitable mass shift. Such a property of Bogoliubov transformations has been already known and used since long time, e.g. in renormalization theory or in the dynamical generation of mass. We then analyze the condensate nature of the flavor vacuum and the roˆle played by the non commutativity between the rotation and the Bogoliubov transformation. This structure of the vacuum also suggests a thermodynamical interpretation which we investigate, showing peculiarities in the thermal behavior due to 2 the character of the particle-antiparticle condensate involved in the flavor vacuum. The key point in our analysis is the non commutativity between rotation and Bogoliubov transformations, a feature which turns out to be at the origin of the inequivalence among mass and flavor vacua. From another point of view, the Bogoliubov transformation are shown to naturally arise when studying the neutrino mixing in the contest of the Noncommutative Spectral Geometry in Alain Connes’ construction and the algebra doubling he introduces. Given the algebraic nature of our arguments, we have good reasons to believe that the results we have obtained are general and also extend to the mixing phenomenon of any particle, even if our analysis is limited to the case of two Dirac neutrinos. Thethesisisstructuredasfollows: afteranIntroduction tothearguments of our work is presented; in Chapter 1 we briefly summarise the main aspects of the Standard Model and of neutrino mixing. Chapter 2 is dedicated to neutrino mixing and oscillations, considering both the quantum mechanics approach and the quantum field theory formalism. In Chapter 3 we analyze the mixing generator, decomposing it into components, and the flavor vacuum structure, studying its thermodynamical properties. A noncommutative structure will arise. Chapter 4 is focused non commutativity, giving some known examples of noncommutative systems, and briefly presenting noncommutative geometry and noncommutative spectral geometry (NCSG) elements. In Chapter 5 we introduce further notions on Alain Connes’ construction; we summarize how neutrinos appear within this construction and werelatethealgebradoubling,whichisacrucialelementoftheNCSGmodel, totheHopfnon-commutativealgebraandBogoliubovtransformations,which play a key role in the neutrino mixing. In Chapter 6, in order to better understand the mixing phenomenon, we study a classical system analogue for it. We then close with our Conclusions and Outlook. 3 The results obtained and presented in this thesis have been published in the following international journals: • M.V. Gargiulo, M. Sakellariadou, G.Vitiello, Doubling of the Algebra and Neutrino Mixing within Noncommutative Spectral Geometry, EPJ C (2014) 74 2695 ; • M.V. Gargiulo, M. Sakellariadou, G.Vitiello, Noncommutativespectralgeometry, Bogoliubovtransformationsandneutrino oscillations, Journal of Physics: Conference Series (2015) 626 012014 ; • M.Blasone, M.V.Gargiulo and G.Vitiello, Disentangling mass and angle dependence in neutrino mixing, Journal of Physics: Conference Series (2015) 626 012026 ; • M. Blasone, M.V. Gargiulo, G. Vitiello, On the role of rotations and Bogoliubov transformations in neutrino mixing, Phys. Lett. B (2016) 761 104; • M.Blasone, M.V. Gargiulo, G.Vitiello, Semiclassical aspect of neutrino mixing Journal of Physics: Conference Series (2017), in press. Work in progress • M.Blasone, M.V. Gargiulo, G.Vitiello, Noncommutative aspects of neutrino mixing, work in progress. [edited by author]
XXIX n.s.