Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude

Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude

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Abstract The Lifting Straps non-linear dynamics of long-wavelength cosmological fluctuations may be phrased in terms of an effective classical, but stochastic evolution equation.The stochastic noise represents short-wavelength modes that continually redshift into the long-wavelength domain.The effective evolution may be derived from first principles quantum field theory Massage Therapy in an expanding background, through a sequence of approximations calling for additional scrutiny.We perform such an analysis, putting particular emphasis on the amplitude of the stochastic noise, which ultimately determines the cosmological correlations and provides a non-perturbative IR regulator to the dynamics.