Small noise expansion of stochastic inflation
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
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| _version_ | 1866912302983282688 |
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| author | Cruces, Diego Germani, Cristiano Nassiri-Rad, Amin Yamaguchi, Masahide |
| author_facet | Cruces, Diego Germani, Cristiano Nassiri-Rad, Amin Yamaguchi, Masahide |
| contents | By introducing the small noise expansion techniques, we show that the fully nonlinear (non-Markovian) stochastic inflationary system, may be re-cast in terms of an infinite set of Wiener processes (stochastic equations with white noises). As a byproduct, we show that the Starobinsky test field approximation might only provide information about the linear regime of cosmological perturbations and scalar-feld non-Gaussianities might only appear at leading order in slow-roll parameters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17987 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Small noise expansion of stochastic inflation Cruces, Diego Germani, Cristiano Nassiri-Rad, Amin Yamaguchi, Masahide Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology By introducing the small noise expansion techniques, we show that the fully nonlinear (non-Markovian) stochastic inflationary system, may be re-cast in terms of an infinite set of Wiener processes (stochastic equations with white noises). As a byproduct, we show that the Starobinsky test field approximation might only provide information about the linear regime of cosmological perturbations and scalar-feld non-Gaussianities might only appear at leading order in slow-roll parameters. |
| title | Small noise expansion of stochastic inflation |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2410.17987 |