Effective noise in stochastic description of inflation

Details Effective noise in stochastic description of inflation Effective noise in stochastic description of inflation

1999-11-08

arxiv.org/abs/gr-qc/9911029v1

Phys.Rev. D61 (2000) 084008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages and 1 EPS figure, RevTeX 4

Scientific paper

10.1103/PhysRevD.61.084008

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.

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