Natural inflation in Palatini $F(R,X)$
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909970290704384 |
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| author | Bostan, N. Dejrah, R. H. Dioguardi, C. Racioppi, A. |
| author_facet | Bostan, N. Dejrah, R. H. Dioguardi, C. Racioppi, A. |
| contents | In the context of Palatini gravity, $F(R+X)$ models, with X the inflaton kinetic term, are characterized by the appealing property of generating asymptotically flat inflaton potentials, exactly like the more commonly studied Palatini $F(R)$ models, but without the complication of non-canonical inflaton kinetic terms in the Einstein frame. In this paper, we study the case of a Jordan frame potential which is positive and bounded, specifically, natural inflation. We compute the CMB observables and show that for a wide class of $F(R + X)$ theories, including the quadratic one, natural inflation is still viable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_16324 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Natural inflation in Palatini $F(R,X)$ Bostan, N. Dejrah, R. H. Dioguardi, C. Racioppi, A. General Relativity and Quantum Cosmology In the context of Palatini gravity, $F(R+X)$ models, with X the inflaton kinetic term, are characterized by the appealing property of generating asymptotically flat inflaton potentials, exactly like the more commonly studied Palatini $F(R)$ models, but without the complication of non-canonical inflaton kinetic terms in the Einstein frame. In this paper, we study the case of a Jordan frame potential which is positive and bounded, specifically, natural inflation. We compute the CMB observables and show that for a wide class of $F(R + X)$ theories, including the quadratic one, natural inflation is still viable. |
| title | Natural inflation in Palatini $F(R,X)$ |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2503.16324 |