Is natural inflation in agreement with CMB data?
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866916216274157568 |
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| author | Santos, F. B. M. dos Rodrigues, G. Rodrigues, J. G. de Souza, R. Alcaniz, J. S. |
| author_facet | Santos, F. B. M. dos Rodrigues, G. Rodrigues, J. G. de Souza, R. Alcaniz, J. S. |
| contents | Natural inflation is a well-motivated model for the early universe in which an inflaton potential of the pseudo-Nambu-Goldstone form, $V(ϕ) = Λ^4[1 + \cos{(ϕ/f)}]$, can naturally drive a cosmic accelerated epoch. This paper investigates the observational viability of the minimally and non-minimally coupled natural inflation scenarios in light of current Cosmic Microwave Background (CMB) observations. We find that a small and negative coupling of the field with gravity can alleviate the well-known observational discrepancies of the minimally coupled model. We perform a Monte Carlo Markov Chain analysis of the Planck 2018 CMB and BICEP/Keck Array B-mode polarization data to estimate how strong the coupling $ξ$ should be to achieve concordance with data. We also briefly discuss the impact of these results on the physical interpretation of the natural inflation scenario. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_12286 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Is natural inflation in agreement with CMB data? Santos, F. B. M. dos Rodrigues, G. Rodrigues, J. G. de Souza, R. Alcaniz, J. S. Cosmology and Nongalactic Astrophysics Natural inflation is a well-motivated model for the early universe in which an inflaton potential of the pseudo-Nambu-Goldstone form, $V(ϕ) = Λ^4[1 + \cos{(ϕ/f)}]$, can naturally drive a cosmic accelerated epoch. This paper investigates the observational viability of the minimally and non-minimally coupled natural inflation scenarios in light of current Cosmic Microwave Background (CMB) observations. We find that a small and negative coupling of the field with gravity can alleviate the well-known observational discrepancies of the minimally coupled model. We perform a Monte Carlo Markov Chain analysis of the Planck 2018 CMB and BICEP/Keck Array B-mode polarization data to estimate how strong the coupling $ξ$ should be to achieve concordance with data. We also briefly discuss the impact of these results on the physical interpretation of the natural inflation scenario. |
| title | Is natural inflation in agreement with CMB data? |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2312.12286 |