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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1991
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paper:paper_05562821_v43_n8_p2498_Calzetta2023-06-08T15:42:11Z Anisotropy dissipation in quantum cosmology Calzetta, Esteban Adolfo 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. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v43_n8_p2498_Calzetta 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. |
| author |
Calzetta, Esteban Adolfo |
| spellingShingle |
Calzetta, Esteban Adolfo Anisotropy dissipation in quantum cosmology |
| author_facet |
Calzetta, Esteban Adolfo |
| author_sort |
Calzetta, Esteban Adolfo |
| 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 |
| publishDate |
1991 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v43_n8_p2498_Calzetta http://hdl.handle.net/20.500.12110/paper_05562821_v43_n8_p2498_Calzetta |
| work_keys_str_mv |
AT calzettaestebanadolfo anisotropydissipationinquantumcosmology |
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1768543040011501568 |