Stochastic inflation from quantum field theory and the parametric dependence of the effective noise amplitude
| Autor: | Andersen, Jens O., Eriksson, Magdalena, Tranberg, Anders |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | JHEP 02 (2022) 121 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/JHEP02(2022)121 |
| Popis: | 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. Comment: 35 pages, 13 figures, references added, typos corrected, matches published version |
| Databáze: | arXiv |
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