Dissertations / Theses on the topic 'Quantum field theory'
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Oeckl, Robert. "Quantum geometry and Quantum Field Theory." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621912.
Full textGupta, Neha. "Homotopy quantum field theory and quantum groups." Thesis, University of Warwick, 2011. http://wrap.warwick.ac.uk/38110/.
Full textPoletti, 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.
Full textKerr, Steven. "Topological quantum field theory and quantum gravity." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14094/.
Full textIvin, Marko. "Topics in quantum field theory." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410042.
Full textRussell, 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.
Full textPatrascu, A. T. "The universal coefficient theorem and quantum field theory." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1476590/.
Full textSmith, John D. "Scalar fields in quantum field theory and black holes." Thesis, University of Newcastle Upon Tyne, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265489.
Full textRondelli, Andrea. "Functional methods in quantum field theory." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15839/.
Full textat, Andreas Cap@esi ac. "Quantum Field Theory as Dynamical System." ESI preprints, 2001. ftp://ftp.esi.ac.at/pub/Preprints/esi1055.ps.
Full textMazur, Daniel Paul. "Nonperturbative quantum field theory in astrophysics." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43255.
Full textO'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.
Full textDaniels, D. R. "Quantum field theory near black holes." Thesis, Swansea University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636346.
Full textCassidy, M. J. "Quantum field theory and acausal spacetimes." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597360.
Full textDolan, F. A. "Aspects of superconformal quantum field theory." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598582.
Full textEllicott, 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.
Full textFlachi, 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.
Full textSmith, C. J. "Energy conditions in quantum field theory." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.434155.
Full textRazzaghe, Ashrafi Babak 1964. "Making and remaking quantum field theory." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29762.
Full textIncludes 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.
Full textOlbermann, Heiner. "Quantum field theory via vertex algebras." Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54994/.
Full text
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.
Full textSprickerhof, Jakob. "Causal structures in quantum field theory." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/10658/.
Full textDi, 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.
Full textAfter 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]
IX n.s.
Collini, Giovanni. "Fedosov Quantization and Perturbative Quantum Field Theory." Doctoral thesis, Universitätsbibliothek Leipzig, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-224698.
Full textRunkel, Ingo. "Boundary problems in conformal field theory." Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326066.
Full textEakins, 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/.
Full textRoberts, Justin Deritter. "Quantum invariants via skein theory." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319336.
Full textFarhi, David. "Jets and Metastability in Quantum Mechanics and Quantum Field Theory." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:26718743.
Full textPhysics
Hättich, Frank. "Whitehead's process philosophy and quantum field theory." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969348061.
Full textBorris, Markus. "Quantum Field Theory on Non-commutative Spacetimes." Doctoral thesis, Universitätsbibliothek Leipzig, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-67788.
Full textSchmidt, Robert. "Defects in Higher-Dimensional Quantum Field Theory." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-71937.
Full textComeau, Marc A. "Premonoidal *-Categories and Algebraic Quantum Field Theory." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22652.
Full textSanders, 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.
Full textMitchard, 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.
Full textBedingham, 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.
Full textKjaergaard, Lars. "Analyticity and scaling in quantum field theory." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4249/.
Full textAli, 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.
Full textYang, Ting-Cheng. "Aspects of gravity in quantum field theory." Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/50763/.
Full textMonoyios, Michael. "New perturbation expansions for quantum field theory." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47573.
Full textTassev, Svetlin Valentinov. "Quantum field theory of scalar cosmological perturbations." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32906.
Full textIncludes 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.
Full textEyink, Gregory Lawrence. "Quantum field-theory in non-integer dimensions /." The Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612164091.
Full textTeresi, 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.
Full textCasali, Eduardo. "Worldsheet methods for perturbative quantum field theory." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/265833.
Full textGargiulo, Maria Vittoria. "On neutrino mixing in Quantum Field Theory." Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2606.
Full textNeutrino 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.
Calderon, Hector Hugo. "Applications of quantum field theory in curved spacetimes." Diss., Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/calderon/CalderonH1207.pdf.
Full textRosaler, Joshua S. "Inter-theory relations in physics : case studies from quantum mechanics and quantum field theory." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:1fc6c67d-8c8e-4e92-a9ee-41eeae80e145.
Full textMoreno, Almeida Javier. "Time evolution of inflaton fields in non-equilibrium quantum field theory." Thesis, University of Leeds, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439566.
Full textGill, Alasdair James. "Field theory and topological defects." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244675.
Full text