Coarse-graining approach to quantum cosmology

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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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Detalles Bibliográficos
Autor principal: Calzetta, E.
Otros Autores: Castagnino, Mario Alberto, Scoccimarro, R.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: 1992
Acceso en línea:Registro en Scopus
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100 1 |a Calzetta, E. 
245 1 0 |a Coarse-graining approach to quantum cosmology 
260 |c 1992 
270 1 0 |m Calzetta, E.; Instituto de Astronomía Y Física del Espacio, Casilla de Correo 67, Sucursal 28, 1428 Buenos Aires, Argentina 
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506 |2 openaire  |e Política editorial 
520 3 |a 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.  |l eng 
593 |a Instituto de Astronomía Y Física del Espacio, Casilla de Correo 67, Sucursal 28, 1428 Buenos Aires, Argentina 
593 |a Departamento de Física, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina 
700 1 |a Castagnino, Mario Alberto 
700 1 |a Scoccimarro, R. 
773 0 |d 1992  |g v. 45  |h pp. 2806-2813  |k n. 8  |x 05562821  |w (AR-BaUEN)CENRE-394  |t Physical Review D 
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