Stochastic semiclassical cosmological models

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 F...

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Autores principales: Calzetta, E., Campos, A., Verdaguer, E.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15507998_v56_n4_p2163_Calzetta
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_15507998_v56_n4_p2163_Calzetta2023-10-03T16:23:35Z Stochastic semiclassical cosmological models Calzetta, E. Campos, A. Verdaguer, E. 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. © 1997 The American Physical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15507998_v56_n4_p2163_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 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. © 1997 The American Physical Society.
format JOUR
author Calzetta, E.
Campos, A.
Verdaguer, E.
spellingShingle Calzetta, E.
Campos, A.
Verdaguer, E.
Stochastic semiclassical cosmological models
author_facet Calzetta, E.
Campos, A.
Verdaguer, E.
author_sort Calzetta, E.
title Stochastic semiclassical cosmological models
title_short Stochastic semiclassical cosmological models
title_full Stochastic semiclassical cosmological models
title_fullStr Stochastic semiclassical cosmological models
title_full_unstemmed Stochastic semiclassical cosmological models
title_sort stochastic semiclassical cosmological models
url http://hdl.handle.net/20.500.12110/paper_15507998_v56_n4_p2163_Calzetta
work_keys_str_mv AT calzettae stochasticsemiclassicalcosmologicalmodels
AT camposa stochasticsemiclassicalcosmologicalmodels
AT verdaguere stochasticsemiclassicalcosmologicalmodels
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