Stochastic approach to inflation II: classicality, coarse-graining and noises

Details Stochastic approach to inflation II: classicality, coarse-graining and noises Stochastic approach to inflation II: classicality, coarse-graining and noises

1998-11-24

arxiv.org/abs/gr-qc/9811083v1

Phys.Rev.D59:063512,1999

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

18 pages, revtex, no figures

Scientific paper

10.1103/PhysRevD.59.063512

In this work we generalize a previously developed semiclassical approach to inflation, devoted to the analysis of the effective dynamics of coarse-grained fields, which are essential to the stochastic approach to inflation. We consider general non-trivial momentum distributions when defining these fields. The use of smooth cutoffs in momentum space avoids highly singular quantum noise correlations and allows us to consider the whole quantum noise sector when analyzing the conditions for the validity of an effective classical dynamical description of the coarse-grained field. We show that the weighting of modes has physical consequences, and thus cannot be considered as a mere mathematical artifact. In particular we discuss the exponential inflationary scenario and show that colored noises appear with cutoff dependent amplitudes.

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