Non-Gaussian tails without stochastic inflation
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
| Veröffentlicht: |
2024
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| _version_ | 1866917833873555456 |
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| author | Ballesteros, Guillermo Konstandin, Thomas Rodríguez, Alejandro Pérez Pierre, Mathias Rey, Julián |
| author_facet | Ballesteros, Guillermo Konstandin, Thomas Rodríguez, Alejandro Pérez Pierre, Mathias Rey, Julián |
| contents | We show, both analytically and numerically, that non-Gaussian tails in the probability density function of curvature perturbations arise in ultra-slow-roll inflation from the $δN$ formalism, without invoking stochastic inflation. Previously reported discrepancies between both approaches are a consequence of not correctly accounting for momentum perturbations. Once they are taken into account, both approaches agree to an excellent degree. The shape of the tail depends strongly on the phase space of inflation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02417 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Non-Gaussian tails without stochastic inflation Ballesteros, Guillermo Konstandin, Thomas Rodríguez, Alejandro Pérez Pierre, Mathias Rey, Julián Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory We show, both analytically and numerically, that non-Gaussian tails in the probability density function of curvature perturbations arise in ultra-slow-roll inflation from the $δN$ formalism, without invoking stochastic inflation. Previously reported discrepancies between both approaches are a consequence of not correctly accounting for momentum perturbations. Once they are taken into account, both approaches agree to an excellent degree. The shape of the tail depends strongly on the phase space of inflation. |
| title | Non-Gaussian tails without stochastic inflation |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2406.02417 |