Effective noise in stochastic description of inflation
General Relativity and Quantum Cosmology
2009-10-31 v1 Astrophysics
High Energy Physics - Theory
Abstract
Stochastic description of inflationary spacetimes emulates the growth of vacuum fluctuations by an effective stochastic ``noise field'' which drives the dynamics of the volume-smoothed inflaton. We investigate statistical properties of this field and find its correlator to be a function of distance measured in units of the smoothing length. Our results apply for a wide class of smoothing window functions and are different from previous calculations by Starobinsky and others who used a sharp momentum cutoff. We also discuss the applicability of some approximate noise descriptions to simulations of stochastic inflation.
Keywords
Cite
@article{arxiv.gr-qc/9911029,
title = {Effective noise in stochastic description of inflation},
author = {S. Winitzki and A. Vilenkin},
journal= {arXiv preprint arXiv:gr-qc/9911029},
year = {2009}
}
Comments
16 pages and 1 EPS figure, RevTeX 4