Inflationary Slow-Roll Parameters in the Jordan Frame for Cosmological F(R) Gravity Models
Fuente:
arXiv
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| Auteur principal: | |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915461875105792 |
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| author | Ivanov, Vsevolod R. |
| author_facet | Ivanov, Vsevolod R. |
| contents | $F(R)$ inflationary models are analyzed without the Weyl transformation to the Einstein frame. Sufficient conditions for existence of global inflationary attractors in $F(R)$ models are provided. Following that, the procedure for calculating inflationary observables completely in the original, Jordan, frame is given. The described procedure is used to analyze a new $F(R)$ inflationary model (a one-parameter deformation of the Starobinsky model), which is shown to provide predictions in good agreement with the recent ACT data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_14250 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inflationary Slow-Roll Parameters in the Jordan Frame for Cosmological F(R) Gravity Models Ivanov, Vsevolod R. General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics $F(R)$ inflationary models are analyzed without the Weyl transformation to the Einstein frame. Sufficient conditions for existence of global inflationary attractors in $F(R)$ models are provided. Following that, the procedure for calculating inflationary observables completely in the original, Jordan, frame is given. The described procedure is used to analyze a new $F(R)$ inflationary model (a one-parameter deformation of the Starobinsky model), which is shown to provide predictions in good agreement with the recent ACT data. |
| title | Inflationary Slow-Roll Parameters in the Jordan Frame for Cosmological F(R) Gravity Models |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2508.14250 |