Post-inflationary enhancement of adiabatic perturbations in modular cosmology
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866912465857544192 |
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| author | Quaglia, Rodrigo Gonzalez Michelotti, Martino Roest, Diederik Carrasco, John Joseph Kallosh, Renata Linde, Andrei |
| author_facet | Quaglia, Rodrigo Gonzalez Michelotti, Martino Roest, Diederik Carrasco, John Joseph Kallosh, Renata Linde, Andrei |
| contents | We show that multi-field inflationary models with negligible turning in field space during inflation can lead to an effective sourcing of adiabatic from entropic perturbations {\it after} the end of inflation. We illustrate this general phenomenon with a detailed analysis of an inflationary model whose scalar potential is determined by modular invariance. Its entropic perturbations are frozen during inflation, but instead, they are converted into adiabatic perturbations in the first post-inflationary $e$-folds. The curvature power spectrum, giving rise to CMB fluctuations, reaches a novel and enhanced plateau in this process; we address the implications for the inflationary observables $A_{s}$, $n_{s}$ and $r$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_03610 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Post-inflationary enhancement of adiabatic perturbations in modular cosmology Quaglia, Rodrigo Gonzalez Michelotti, Martino Roest, Diederik Carrasco, John Joseph Kallosh, Renata Linde, Andrei Cosmology and Nongalactic Astrophysics We show that multi-field inflationary models with negligible turning in field space during inflation can lead to an effective sourcing of adiabatic from entropic perturbations {\it after} the end of inflation. We illustrate this general phenomenon with a detailed analysis of an inflationary model whose scalar potential is determined by modular invariance. Its entropic perturbations are frozen during inflation, but instead, they are converted into adiabatic perturbations in the first post-inflationary $e$-folds. The curvature power spectrum, giving rise to CMB fluctuations, reaches a novel and enhanced plateau in this process; we address the implications for the inflationary observables $A_{s}$, $n_{s}$ and $r$. |
| title | Post-inflationary enhancement of adiabatic perturbations in modular cosmology |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2507.03610 |