TY - JOUR
AB - We adopt methods from statistical field theory to stochastic inflation. For the example of a free test field in de Sitter and power-law inflation, the power spectrum of long-wavelength fluctuations is computed. We study its dependence on the shape of the filter that separates long- from short-wavelength modes. While for filters with infinite support the phenomenon of dimensional reductions is found on large superhorizon scales, filters with compact support return a scale-invariant power spectrum in the infrared. Features of the power spectrum, induced by the filter, decay within a few e-foldings. Thus the late-time power spectrum is independent of the filter details.
AU - Kuehnel, Florian
AU - Schwarz, Dominik
ID - 1635369
IS - 4
JF - PHYSICAL REVIEW D
SN - 1550-7998
TI - Stochastic inflation and replica field theory
VL - 79
ER -