Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/12308
Title: Stochastic semiclassical cosmological models
Author: Campos, Antonio
Calzetta, Esteban A., 1958-
Verdaguer Oms, Enric, 1950-
Keywords: Relativitat (Física)
Gravitació
Física estadística
Teoria quàntica
Cosmologia
Relativity (Physics)
Gravitation
Cosmology
Statistical physics
Quantum theory
Issue Date: 1997
Publisher: The American Physical Society
Abstract: We consider the classical stochastic fluctuations of spacetime geometry induced by quantum fluctuations of massless nonconformal matter fields in the early Universe. To this end, we supplement the stress-energy tensor of these fields with a stochastic part, which is computed along the lines of the Feynman-Vernon and Schwinger-Keldysh techniques; the Einstein equation is therefore upgraded to a so-called Einstein-Langevin equation. We consider in some detail the conformal fluctuations of flat spacetime and the fluctuations of the scale factor in a simple cosmological model introduced by Hartle, which consists of a spatially flat isotropic cosmology driven by radiation and dust.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevD.56.2163
It is part of: Physical Review D, 1997, vol. 56, núm. 4, p. 2163-2172
URI: http://hdl.handle.net/2445/12308
ISSN: 0556-2821
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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