Stochastic semiclassical cosmological models

Esteban Calzetta, Antonio Campos, and Enric Verdaguer
Phys. Rev. D 56, 2163 – Published 15 August 1997
PDFExport Citation

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.

  • Received 21 March 1997

DOI:https://doi.org/10.1103/PhysRevD.56.2163

©1997 American Physical Society

Authors & Affiliations

Esteban Calzetta

  • Instituto de Astronomía y Física del Espacio (IAFE) and Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina

Antonio Campos

  • Grup de Física Teòrica and Institut de Física d’Altes Energies (IFAE), Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
  • Department of Physics, University of Maryland, College Park, Maryland 20742

Enric Verdaguer

  • Departament de Física Fonamental and IFAE, Universitat de Barcelona, Avinguda Diagonal 647, 08028 Barcelona, Spain

References (Subscription Required)

Click to Expand
Issue

Vol. 56, Iss. 4 — 15 August 1997

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review D

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×