Global ETD Search
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 183 for “"Field theories"”.
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Effective Field Theories in Cosmology
… origin of the cosmological constant. Effective field theory methods provide a natural framework to try to address such outstanding questions. For instance, such methods have been extensively used to study alternative theories of gravity which mimic a non-vanishing cosmological constant and to …
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Renormalization of cavity field theories
… obstacle to calculating Feynman diagrams in field theories, confined to a cavity, has always been the divergent loop diagrams. So far, only the quantum chromodynamic and electrodynamic self-energies of a ls1/2 quark, confined to a static spherical cavity, have been accurately calculated. …
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Topological field theories and fractional statistics
… the sigma-model. We show that solutions to the field equation are represented by solitons. We also recover braid group representations for the low energy limit of soliton exchange.
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A construction of topological field theories
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2018-08-01
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Cocycle Constructions for Topological Field Theories
… that produces data for extended topological field theories. For closed oriented manifolds $\Sigma$, this construction takes the form of a chain map $\tau_\Sigma$ from the smooth \v{C}ech-Deligne complex on a manifold $X$ to a degree-shifted version of the same complex on the mapping space …
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Effective field theories for the LHC
In this thesis I study applications of effective field theories to understand aspects of QCD jets and their substructure at the Large Hadron Collider. In particular, I introduce an observable, D2 , which can be used for distinguishing boosted W/Z/H bosons from the QCD background using information …
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Heavy quarks in effective field theories
… aspects of heavy quark systems in an effective field theory framework, including both phenomenological and formal applications. Phenomenological applications include the leading calculation of penguin amplitudes in charmless non-leptonic B-decays to light mesons, including power suppressed …
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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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Moduli Space of (0,2) Conformal Field Theories
… thesis we study aspects of (0,2) superconformal field theories (SCFTs), which are suitable for compactification of the heterotic string. In the first part, we study a class of (2,2) SCFTs obtained by fibering a Landau-Ginzburg (LG) orbifold CFT over a compact K\"ahler base manifold. While such …
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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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Top mass determination using Effective Field Theories
… due to lack of specification of a precise field theoretic definition. Here a kinematic extraction method for obtaining a precisely defined short distance top mass at the LHC is proposed. A formula for factorized top jet mass cross section in the peak region is derived using methods of …
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Renormalization group analysis of scalar field theories
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Topics in field theories in lower dimensions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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Effective field theories for inclusive B decays
… Model. We use the framework of effective field theories, in particular the Soft-Collinear Effective Theory, which is a suitable method when the decay products include a jet-like set of hadronic states. We derive factorization theorems for ... corrections (including all orders in a,) to ... …
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Topics in the quantization of classical field theories
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-21T13:57:29Z No. of bitstreams: 1 1980_katz.pdf: 2240678 bytes, checksum: bba343cd35c573af717f5355a879a8c9 (MD5)
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Gravitational Effective Field Theories and Black Hole Mechanics
… GR. One approach is the framework of effective field theory (EFT), where the Lagrangian is treated as a series of higher derivative terms scaling with some UV parameter beyond which we have "integrated out" the unknown physics. This thesis is concerned with studying two issues in gravitational …
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Efficient Monte Carlo Sampling of Lattice Field Theories
Monte Carlo Sampling of Quantum Field Theories suffers from many inefficiencies. These inefficiencies, among other things, make determination of the QCD phase diagram and calculation of the correlation functions numerically difficult. As a step towards eventually overcoming these issues, the …
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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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