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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 50 for “"quantum field theories"”.
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On homotopical algebra and quantum field theories
… prueban nuevos teoremas de localización de Bousfield para estructuras de semimodelos, dando a su vez aplicaciones en otras áreas de las matemáticas como el álgebra homológica y la topología algebraica. Se estudian también dos construcciones fundamentales en teoría de opéradas: la envolvente …
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Quantum-Field Theories on the Light-Front
Made available in DSpace on 2015-05-12T22:39:07Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7412165.PDF: 4639521 bytes, checksum: 44b0d1a00475af3e92359e4ad1f8ae69 (MD5) Previous issue date: 1973
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Quantum field theories on the light front
Several popular field theories are quantized on light fronts, that is O 3 surfaces defined by x + = x0 + x3 = constant. Schwinger's quantum ac tion principle is employed to deduce the correct canonical equal-x+(anti-) commutation relations. The formulations developed for free fields of …
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Aspects of Riemannian geometry in quantum field theories
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Functional formalism for algebraic classical and quantum field theories
… of the recent algebraic approach to classical field theory by proposing a more general setting based on the manifold of smooth sections of a non-trivial fiber bundle. Central is the notion of observables/functionals over such sections, i.e. appropriate smooth functions on them. The kinematic …
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Indices for Supersymmetric Quantum Field Theories in Four Dimensions
… electric-magnetic duality in supersymmetric field theories. In the first chapter, we first define the index and underline its cohomological nature, before giving a first computation based on representation theory of free superconformal field theories. After listing all representations of the …
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Lessons on interacting quantum field theories from string theory
… 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 …
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On the exact renormalization of states in quantum field theories
… is a cornerstone of our modern understanding of quantum field theory and many body physics. As quantum information becomes an increasingly important tool in our understanding of continuum theories, new techniques are needed to understand how renormalization interacts with the strictly quantum …
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Aspects of hadron and instatnton physics in lattice quantum field theories
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1997.
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Non-Perturbative studies of quantum field theories with classical and quantum simulations
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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Algorithmic Quantum-State Generation for Simulating Quantum Field Theories on a Quantum Computer
Simulating a quantum field theory (QFT) on a quantum computer comprises three steps: generating an initial state, simulating time evolution and measuring observables, with the initial-state generation being the most expensive step for the entire simulation. In this thesis, we introduce a general …
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On defect CFT and path integral methods for entanglement in quantum field theories
… based on the replica trick for characterizing quantum information in quantum field theories. We calculate a coefficient that characterizes the strength of the two point function of the displacement operator in the replica twist defect placed in a holographic CFT, which controls the second order …
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Simulation of curved-space quantum field theories with two-component Bose-Einstein condensates: from black-hole physics to cosmology
… the possibility of simulating the dynamics of quantum fields in curved spacetimes using sound-waves propagating in moving fluids: a supersonic flow would indeed influence the dynamics of sound similarly to what happens to light when it’s dragged by the spacetime geometry in strong gravity …
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Operads and moduli spaces
… of homotopy algebras and new constructions of 'quantum invariants' of manifolds inspired by ideas originating from physics. We consider the extension of classical 2-dimensional topological quantum field theories to Klein topological quantum field theories which allow unorientable surfaces. We …
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Chiral Phases on the Lattice
While chiral quantum field theories (QFTs) describe a wide range of physical systems, from the standard model to topological quantum matter, the realization of chiral QFTs on a lattice has proved to be difficult due to the Nielsen-Ninomiya theorem and the possible presence of quantum anomalies. In …
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The QED beta-Function: A First Principles Derivation
Quantum electrodynamics (QED) is a quantum-relativistic theory for electromagnetism. It is among the most successful quantum field theories, which collectively describe the dynamics of elementary particles at high energies. Unfortunately, the dynamical expressions for interacting theories do not …
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Geometric Aspects of Supersymmetric Partition Functions
… suitable concepts in K-theory. We show that quantum field theories predict nontrivial results in K-theory. We focus on supersymmetric quantum field theories in one and three dimensions. Nevertheless, our approach and results can be generalized to other dimensions. We start by discussing the …
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Invertible Functorial Field Theory for Symmetry Breaking and Interactions in Quantum Field Theory
We apply invertible field theories to study two questions in quantum field theory. Specifically, we study reflection-positive fully-extended invertible field theories on manifolds with twisted spin structures, which are computed as Anderson-dual bordism groups [1, 2]. In high energy physics, …
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Conformal Field Theory Descriptions of String Initial Conditions and Quantum Entanglement Entropy
Quantum theories are filled with predictions which defy any classical analog. Perhaps the phenomenon which is most bizarre from a classical perspective is entanglement. This effect is the driving force behind the growing interest in quantum information. From entanglement, one is naturally led to …
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Aspects of Supersymmetry
… discussion of various aspects of supersymmetric quantum field theories in four and two dimensions. In four dimensions, 𝒩 = 1 supersymmetric quantum gauge theories on various four-manifolds are constructed. Many of their properties, some of which are distinct to the theories on flat spacetime, are …
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