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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_05562821_v45_n8_p2806_Calzetta |
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todo:paper_05562821_v45_n8_p2806_Calzetta2023-10-03T15:35:24Z Coarse-graining approach to quantum cosmology Calzetta, E. Castagnino, M. Scoccimarro, R. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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. |
| format |
JOUR |
| author |
Calzetta, E. Castagnino, M. Scoccimarro, R. |
| spellingShingle |
Calzetta, E. Castagnino, M. Scoccimarro, R. Coarse-graining approach to quantum cosmology |
| author_facet |
Calzetta, E. Castagnino, M. Scoccimarro, R. |
| author_sort |
Calzetta, E. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_05562821_v45_n8_p2806_Calzetta |
| work_keys_str_mv |
AT calzettae coarsegrainingapproachtoquantumcosmology AT castagninom coarsegrainingapproachtoquantumcosmology AT scoccimarror coarsegrainingapproachtoquantumcosmology |
| _version_ |
1807323000287002624 |