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1997

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/12308

Stochastic semiclassical cosmological models

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http://dx.doi.org/10.1103/PhysRevD.56.2163

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.

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Relativitat (Física), Gravitació, Física estadística, Teoria quàntica, Cosmologia

Subject (English)

Relativity (Physics), Gravitation, Cosmology, Statistical physics, Quantum theory

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

CAMPOS, Antonio, CALZETTA, Esteban A. and VERDAGUER OMS, Enric. Stochastic semiclassical cosmological models. Physical Review D. 1997. Vol. 56, num. 4, pags. 2163-2172. ISSN 0556-2821. [consulted: 13 of June of 2026]. Available at: https://hdl.handle.net/2445/12308

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