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Abstract:

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.

Registro:

Documento: Artículo
Título:Coarse-graining approach to quantum cosmology
Autor:Calzetta, E.; Castagnino, M.; Scoccimarro, R.
Filiación:Instituto de Astronomía Y Física del Espacio, Casilla de Correo 67, Sucursal 28, 1428 Buenos Aires, Argentina
Departamento de Física, Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Año:1992
Volumen:45
Número:8
Página de inicio:2806
Página de fin:2813
DOI: http://dx.doi.org/10.1103/PhysRevD.45.2806
Título revista:Physical Review D
ISSN:05562821
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_05562821_v45_n8_p2806_Calzetta

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Citas:

---------- APA ----------
Calzetta, E., Castagnino, M. & Scoccimarro, R. (1992) . Coarse-graining approach to quantum cosmology. Physical Review D, 45(8), 2806-2813.
http://dx.doi.org/10.1103/PhysRevD.45.2806
---------- CHICAGO ----------
Calzetta, E., Castagnino, M., Scoccimarro, R. "Coarse-graining approach to quantum cosmology" . Physical Review D 45, no. 8 (1992) : 2806-2813.
http://dx.doi.org/10.1103/PhysRevD.45.2806
---------- MLA ----------
Calzetta, E., Castagnino, M., Scoccimarro, R. "Coarse-graining approach to quantum cosmology" . Physical Review D, vol. 45, no. 8, 1992, pp. 2806-2813.
http://dx.doi.org/10.1103/PhysRevD.45.2806
---------- VANCOUVER ----------
Calzetta, E., Castagnino, M., Scoccimarro, R. Coarse-graining approach to quantum cosmology. 1992;45(8):2806-2813.
http://dx.doi.org/10.1103/PhysRevD.45.2806