Coarse-graining approach to quantum cosmology

We consider a Friedmann-Robertson-Walker model with both classical radiation and a massive (conformally coupled) quantum scalar field in the framework of quantum cosmology. We define a density matrix and introduce a notion of "relevance" which splits this density matrix into a "releva...

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Autores principales: Calzetta, Esteban Adolfo, Castagnino, Mario Alberto G. J., Scoccimarro, Eduardo Roman
Publicado: 1992
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v45_n8_p2806_Calzetta
http://hdl.handle.net/20.500.12110/paper_05562821_v45_n8_p2806_Calzetta
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_05562821_v45_n8_p2806_Calzetta
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spelling paper:paper_05562821_v45_n8_p2806_Calzetta2023-06-08T15:42:13Z Coarse-graining approach to quantum cosmology Calzetta, Esteban Adolfo Castagnino, Mario Alberto G. J. Scoccimarro, Eduardo Roman We consider a Friedmann-Robertson-Walker model with both classical radiation and a massive (conformally coupled) quantum scalar field in the framework of quantum cosmology. We define a density matrix and introduce a notion of "relevance" which splits this density matrix into a "relevant" and an "irrelevant" part. A "generalized coarse-graining method" is used to obtain the evolution (in Robertson-Walker a "time") of the relevant density matrix, taking into account the back reaction of the irrelevant variables. We discuss the physical basis for the choice of a concept of relevance, and the features of cosmic evolution brought forward by the effective dynamics. In the limit of "small universes," the relevant subdynamics is dissipative. © 1992 The American Physical Society. Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Castagnino, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Scoccimarro, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1992 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v45_n8_p2806_Calzetta http://hdl.handle.net/20.500.12110/paper_05562821_v45_n8_p2806_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 consider a Friedmann-Robertson-Walker model with both classical radiation and a massive (conformally coupled) quantum scalar field in the framework of quantum cosmology. We define a density matrix and introduce a notion of "relevance" which splits this density matrix into a "relevant" and an "irrelevant" part. A "generalized coarse-graining method" is used to obtain the evolution (in Robertson-Walker a "time") of the relevant density matrix, taking into account the back reaction of the irrelevant variables. We discuss the physical basis for the choice of a concept of relevance, and the features of cosmic evolution brought forward by the effective dynamics. In the limit of "small universes," the relevant subdynamics is dissipative. © 1992 The American Physical Society.
author Calzetta, Esteban Adolfo
Castagnino, Mario Alberto G. J.
Scoccimarro, Eduardo Roman
spellingShingle Calzetta, Esteban Adolfo
Castagnino, Mario Alberto G. J.
Scoccimarro, Eduardo Roman
Coarse-graining approach to quantum cosmology
author_facet Calzetta, Esteban Adolfo
Castagnino, Mario Alberto G. J.
Scoccimarro, Eduardo Roman
author_sort Calzetta, Esteban Adolfo
title Coarse-graining approach to quantum cosmology
title_short Coarse-graining approach to quantum cosmology
title_full Coarse-graining approach to quantum cosmology
title_fullStr Coarse-graining approach to quantum cosmology
title_full_unstemmed Coarse-graining approach to quantum cosmology
title_sort coarse-graining approach to quantum cosmology
publishDate 1992
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v45_n8_p2806_Calzetta
http://hdl.handle.net/20.500.12110/paper_05562821_v45_n8_p2806_Calzetta
work_keys_str_mv AT calzettaestebanadolfo coarsegrainingapproachtoquantumcosmology
AT castagninomarioalbertogj coarsegrainingapproachtoquantumcosmology
AT scoccimarroeduardoroman coarsegrainingapproachtoquantumcosmology
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