Anisotropy dissipation in quantum cosmology

We study the issue of decoherence and dissipation in the wave function of the Universe for a Bianchi type-I universe with classical and quantum matter. We obtain a coarse-grained description by tracing over the matter degrees of freedom. Provided that for small universes the wave function of the uni...

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Autor principal: Calzetta, E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_05562821_v43_n8_p2498_Calzetta
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_05562821_v43_n8_p2498_Calzetta
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spelling todo:paper_05562821_v43_n8_p2498_Calzetta2023-10-03T15:35:22Z Anisotropy dissipation in quantum cosmology Calzetta, E. We study the issue of decoherence and dissipation in the wave function of the Universe for a Bianchi type-I universe with classical and quantum matter. We obtain a coarse-grained description by tracing over the matter degrees of freedom. Provided that for small universes the wave function of the universe is concentrated on a neighborhood of the isotropic configuration, then the coarse-grained density matrix of the universe will show an even more marked peak around isotropy for large universes. In this sense we can say that, while decoherence makes the reduced density matrix of the universe diagonal, dissipation causes the universe to be isotropic with a high probability for large radii. © 1991 The American Physical Society. Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_05562821_v43_n8_p2498_Calzetta
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description We study the issue of decoherence and dissipation in the wave function of the Universe for a Bianchi type-I universe with classical and quantum matter. We obtain a coarse-grained description by tracing over the matter degrees of freedom. Provided that for small universes the wave function of the universe is concentrated on a neighborhood of the isotropic configuration, then the coarse-grained density matrix of the universe will show an even more marked peak around isotropy for large universes. In this sense we can say that, while decoherence makes the reduced density matrix of the universe diagonal, dissipation causes the universe to be isotropic with a high probability for large radii. © 1991 The American Physical Society.
format JOUR
author Calzetta, E.
spellingShingle Calzetta, E.
Anisotropy dissipation in quantum cosmology
author_facet Calzetta, E.
author_sort Calzetta, E.
title Anisotropy dissipation in quantum cosmology
title_short Anisotropy dissipation in quantum cosmology
title_full Anisotropy dissipation in quantum cosmology
title_fullStr Anisotropy dissipation in quantum cosmology
title_full_unstemmed Anisotropy dissipation in quantum cosmology
title_sort anisotropy dissipation in quantum cosmology
url http://hdl.handle.net/20.500.12110/paper_05562821_v43_n8_p2498_Calzetta
work_keys_str_mv AT calzettae anisotropydissipationinquantumcosmology
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