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 30 for “"gauge symmetry"”.
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Enhanced gauge symmetry in 6D F-theory
… structures, corresponding to combinations of gauge algebras and (potentially shared) matter, can arise in F-theory. This classification is performed using local geometric calculations. This investigation reveals an exceedingly tight correspondence between F-theory models and consistent …
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Two applications of Berry's phase in fermionic field theory
… sea are studied: the anomalous commutator in gauge field theory and the intrinsic orbital angular momentum in superftuid 3He-A. Chapter 1 is a brief introduction. Chapter 2 reviews Berry's Phase and several toy models. Effective actions are calculated for two models in gradient expansions and …
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Why Gauge? Conceptual Aspects of Gauge Theory
This thesis is about conceptual aspects of gauge theories. Gauge theories lie at the heart of modern physics: in particular, they constitute the standard model of particle physics. At its simplest, the idea of gauge is that nature is best described using a descriptively redundant language; the …
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Quantization of anomalous gauge theories
"We discuss the quantization of Anomalous Gauge Theories (AGT) both in the context of functional integration and canonical Hamiltonian approach. The Wess-Zumino term (WZT), which repairs gauge symmetry in AGT is discussed and its derivation is presented in the canonical approach as a consequence of …
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Some aspects of non-Abelian gauge theories
… two aspects of the theory of non-Abelian gauge fields. In the first part,we calculate the fermion-fermion scattering amplitude for a non-Abelian gauge theory with SU(N) gauge symmetry in the limit of high energy with fixed momentum transfer through sixth order in the coupling constant. We …
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Quantization of anomalous gauge theories
"We discuss the quantization of Anomalous Gauge Theories (AGT) both in the context of functional integration and canonical Hamiltonian approach. The Wess-Zumino term (WZT), which repairs gauge symmetry in AGT is discussed and its derivation is presented in the canonical approach as a consequence of …
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Upgrading particle identification and searching for leptophobic bosons at GlueX
… which is a proposed particle generated by a U(1) gauge symmetry associated with baryon number. This preparation includes the data-driven determination of GLUEX properties such as reconstruction efficiencies and invariant mass resolution. A paper containing these results is expected to go into …
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Valence transition and superconductivity in the extended periodic Anderson model
… start from an Hamiltonian which includes small gauge symmetry breaking fields. We derive renormalization equations, from which the superconducting pairing functions are self-consistently determined. Our analytical and numerical results show that d- wave superconductivity becomes dominant in the …
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Predictions and Constraints of Cosmological Correlators
… latter type of analysis, we consider the role of gauge symmetry in constraining relations between $n$- and $(n+1)$-point correlation functions for gravity coupled to a scalar field. Using certain assumptions, we show how novel consistency relations between fields can be derived, that arise only …
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Looking Beyond the Standard Model from the Lattice
… Higgs mechanism. In particular we use lattice gauge theory techniques, to understand the inherent symmetry breaking patterns of three specific BSM (beyond the standard model) theories. The first model (in chapter 3) describes the spontaneous symmetry breaking pattern in a two dimensional, eight …
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Some Aspects of Symmetry Breaking in Unified Weak-Electromagnetic Gauge Theories
<p>In this thesis, we focus on some problems of symmetry breaking in unified weak-electromagnetic gauge theories. In Chapter I we set the scene with a brief history of weak interaction theory up until the impasse which led to the development of the unified weak-electromagnetic gauge theory …
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Radiative Corrections to and Connections Among Theories With Lorentz Violation and Time-Varying Couplings
… possible mechanism to generate Lorentz, CPT and gauge symmetry violations in quantum electrodynamics. The vacuum polarization diagram and fermion self-energy are studied in order to study the consequences of a time-varying &alpha on photon and fermion propagation. </p> <p> In the weak sector, …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… few occupied) electron states. Issues of gauge symmetry, conservation laws, Fermion statistics (crossing symmetry), and shake-up effects are discussed. We find GW with generalized RPA vertex corrections treats accurately ion core dipole polarizabilities and corrections to binding energies …
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Quasiparticle calculations in atoms and many-body core-valence partitioning
… few occupied) electron states. Issues of gauge symmetry, conservation laws, Fermion statistics (crossing symmetry), and shake-up effects are discussed. We find GW with generalized RPA vertex corrections treats accurately ion core dipole polarizabilities and corrections to binding energies …
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Probing proximity-induced superconductivity in Nb- Bi2Se3 bilayers with low-temperature transport and Josephson interferometry
… discovered serendipitously, spontaneously break gauge symmetry. In contrast, topological insulators are defined by a topological invariant of their band structure. Theoretical work in 2008 proposed a novel way to engineer an exotic superconducting system using the proximity effect to blend the …
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The BCS - BEC Crossover in Ultracold Fermion Gases
… to the spontaneous breaking of global $U(1)$ gauge symmetry which underlies both quantum condensation phenomena. Recently much attention has been paid to this problem, since Feshbach resonances allow for an experimental implementation of crossover physics in cold fermion gases. The strong …
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Improvement of Stress -Energy Tensor Using Space -Time Symmetries
… two remarkable results: (1) full conformal symmetry over the flat space-time is sufficient but not necessary for the existence of the improved tensor; (2) quite surprisingly, the improved stress-energy tensor exists in all space-time dimensions for a free massless Abelian U(1) gauge theory …
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Improvement of stress-energy tensor using space-time symmetries
… two remarkable results: (1) full conformal symmetry over the flat space-time is sufficient but not necessary for the existence of an improved tensor; (2) quite surprisingly, the improved stress-energy tensor exists in all space-time dimensions for a free massless Abelian U(1) gauge theory …
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Precision theory for LHC/FCC : new results for the five point function and interface between KKMC-hh and MG5_aMC@NLO.
… at present, which is formulated by a gauge quantum field theory with gauge symmetry SU(3)C ⊗ SU(2)L ⊗ U(1)Y. With the discovery of the Higgs boson, the era of the sub-1% precision on processes such as Z and W production is approaching us. In order to achieve the 1% theoretical …
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Causality and unitarity in the early universe
… a dielec- tric as an open system, highlighting gauge symmetry and the role of dissipation in current and noise conservation. This chapter includes a discussion of the extension of this formalism to gravity. Chapter 8 presents positivity bounds from a new de Sitter S-matrix. These bounds are used …
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