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.
Results
Showing 1 to 10 of 10 for “"non-zero temperature"”.
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Chiral symmetry restoration in the three-dimensional four-fermion model at non-zero temperature and density
… four-fermion model with a Z2 chiral symmetry at non-zero temperature Tor non-zero chemical potential μ is investigated. The main purpose of the study is to serve as an orientation for the more complex problem of the chiral phase transition in Quantum Chromodynamics. It is shown that the critical …
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Characteristic polynomials of random matrices and their role in an effective theory of strong interactions
… describing effects of external sources like temperature and its combination with Nf massiv flavors. The correlations of the chGUE(N), and its extensions with external parameters, als well as its deformations with massive flavors, belong the class of determinantal point processes. This implies …
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Aspects of strongly-coupled field theory from gauge-gravity duality
… associated to mesonlike excitations in non-zero temperature gravity duals and apply it to excitations of bosonic and fermionic type. We study the thermal phase transition in a somewhat QCD-like gravity dual deformed by the presence of a relevant operator and find a plausible transition …
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Quantum Dynamics of Strongly-Interacting Bosons in Optical Lattices with Disorder
… can aid in identifying a Bose-glass phase. Our zero temperature results offer important insights into mechanisms of transport of atoms in trapped optical lattices while putting bounds on center of mass dynamics expected at non-zero temperature. In the second work, we study the domain wall …
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The multi Davydov-Ansatz
… of freedom facilitates exploration of the zero and non-zero temperature physics of both system and environment of open quantum systems in the strong coupling regime, even in cases where the system is laser-driven. The discovery that strongly coupling a system to an environment may, apart …
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Low-dimensional quantum systems
… outlook for determining the phases that occur at non-zero temperature. Secondly, we investigate Mott-Wannier complexes of two (excitons), three (trions) and four (biexcitons) charge carriers in two-dimensional semiconductors. The fermions interact through an effective interaction of a form …
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Phase transitions in lattice gauge theories
… the role of topological excitations in the non-compact lattice version of the Abelian Higgs model. The Villain form of the non-compact model's partition function is represented as a sum over world-sheets of gauge-invariant ""vortex"" sheets. The phase transition of the system is then related …
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Spontaneous symmetry breaking transport : from anomalous response to chiral separation
… driving forces at several examples. For any non-zero temperature, the average velocity vanishes but there may be dynamical states of sustained transport spontaneously breaking the symmetry in the deterministic limit, named spontaneous symmetry breaking transport. If the symmetry of the …
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Fluctuation-induced interactions and nonlinear nanophotonics
… methods for studying Casimir forces and nonlinear frequency conversion in nanophotonic media consisting of arbitrary geometries and materials. The first section of the thesis focuses on the study of various geometry-enabled resonant effects leading to strong nonlinear interactions. The …
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Modelling and inference in active systems
Non-equilibrium systems, or active systems, span virtually all disciplines of science. While the underlying processes driving these systems out of equilibrium (may that be thermal, chemical or another type of equilibrium) may be entirely unrelated, it is often the case that the same or a similar …