Title:
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Stochastic semiclassical cosmological models
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Author:
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Campos, Antonio; Calzetta, Esteban A., 1958-; Verdaguer Oms, Enric, 1950-
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Relativitat (Física) -Gravitació -Física estadística -Teoria quàntica -Cosmologia -Relativity (Physics) -Gravitation -Cosmology -Statistical physics -Quantum theory |
Rights:
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(c) The American Physical Society, 1997
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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