Power-law $F(R)$ Gravity as Deformations to Starobinsky Inflation in View of ACT
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| Format: | Preprint |
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2025
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| author | Odintsov, S. D. Oikonomou, V. K. |
| author_facet | Odintsov, S. D. Oikonomou, V. K. |
| contents | In this work we aim to provide a new parametrization of power-law $F(R)$ gravity inflation framework in the Jordan frame. It is known in the literature that the power-law $F(R)$ gravity inflation of the form $F(R)=R+βR^n$ is non-viable and produces a power-law evolution. We demonstrate that the standard approach in power-law $F(R)$ gravity inflation has some parametrization issues that may lead to inconsistencies and we introduce a new parametrization which elevates the role of power-law $F(R)$ gravity deformations of the Starobinsky inflation, making it viable and compatible with both the Planck and ACT data. In our approach the power-law $F(R)$ gravity inflation is disentangled from a power-law evolution. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_06251 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Power-law $F(R)$ Gravity as Deformations to Starobinsky Inflation in View of ACT Odintsov, S. D. Oikonomou, V. K. General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory In this work we aim to provide a new parametrization of power-law $F(R)$ gravity inflation framework in the Jordan frame. It is known in the literature that the power-law $F(R)$ gravity inflation of the form $F(R)=R+βR^n$ is non-viable and produces a power-law evolution. We demonstrate that the standard approach in power-law $F(R)$ gravity inflation has some parametrization issues that may lead to inconsistencies and we introduce a new parametrization which elevates the role of power-law $F(R)$ gravity deformations of the Starobinsky inflation, making it viable and compatible with both the Planck and ACT data. In our approach the power-law $F(R)$ gravity inflation is disentangled from a power-law evolution. |
| title | Power-law $F(R)$ Gravity as Deformations to Starobinsky Inflation in View of ACT |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2509.06251 |