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 8 of 8 for “"non-linear sigma model"”.
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A study of the chiral phase transition in the non-linear sigma model
… is studied using the three dimensional nonlinear sigma model. Numerical simulations with the U(N) x U(N) and SU(N) x SU(N) flavor symmetries for both two and three flavors were examined to determine the order of the phase transition. The data from the simulations in the appropriate …
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Some problems of quantum cosmology and dark matter physics
… by embedding the Robertson-Walker metric in the non-linear $\sigma$ model. We find that initially the universe exists in a series of metastable bound states with the scale factor taking discrete values. Then it tunnels through a barrier and comes out in an inflationary state. This tunneling (or …
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A study of the chiral phase transition in the nonlinear sigma model
… is studied using the three dimensional non-linear sigma model. Numerical simulations with the U(N) $\times$ U(N) and SU(N) $\times$ SU(N) flavor symmetries for both two and three flavors were examined to determine the order of the phase transition. The data from the simulations in the …
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Topological field theories and fractional statistics
… Abelian Chern-Simons theory interacting with non-dynamical matter. We generalize the quantization of Chern-Simons theory to the case where the coefficient of the Chern-Simons term, k, is rational, the Riemann surface has arbitrary genus and the total matter charge is non-vanishing. We find an …
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NEW GRAVITATIONAL INTERACTIONS IN COSMOLOGY —- FROM EFFECTIVE FIELD THEORY TO OBSERVATION
… cosmic epochs, and proposing a theoretical model that suggests an interaction between neutrinos and gravity could help alleviate this tension. I then turn to more formal considerations of Effective Field Theories (EFTs) in cosmology. In particular, I show how to generalize the EFT of the …
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The semi-classical approximation in a hierarchy of models with instantons
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-20T16:52:56Z No. of bitstreams: 1 1980_neinast.pdf: 2304128 bytes, checksum: 5411988c7855ca58a2b3ebd5e4f54dca (MD5)
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Cold, dense quark matter
… Specifically, we study effective quark models, the symmetry pattern of different quark matter phases, the collective modes associated with spontaneous chiral symmetry breaking, a possible realization of quark-hadron continuity in the color-flavor locked (CFL) quark superfluid, and the …
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Topological effects in particle physics phenomenology
… of topological terms appearing in a non-linear sigma model based on maps from an arbitrary worldvolume manifold to a homogeneous space $G/H$ (where $G$ is an arbitrary Lie group and $H \subset G$). Such models are ubiquitous in phenomenology; in three or more dimensions they cover all …