Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude
Nov 29, 2021
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Abstract: (Springer)
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 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 the stochastic noise, which ultimately determines the cosmological correlations and provides a non-perturbative IR regulator to the dynamics.Note:
- 35 pages, 13 figures, references added, typos corrected, matches published version
- Cosmology of Theories beyond the SM
- Effective Field Theories
- Nonperturbative Effects
- Thermal Field Theory
- noise: stochastic
- inflation: stochastic
- nonlinear
- redshift
- fluctuation
- nonperturbative
References(48)
Figures(0)
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