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

Blog Article

Abstract The 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 sweatshirt effective evolution may be derived from first principles quantum field theory 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 Chicken the stochastic noise, which ultimately determines the cosmological correlations and provides a non-perturbative IR regulator to the dynamics.