Power-law F(R) gravity as deformations to Starobinsky inflation in view of ACT
Year: 2025
Type: article
Abstract: 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.
Source: Physics Letters B
Authors: S.D. Odintsov, V.K. Oikonomou
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Award: G3019979265
OpenAlex ID: W7083188990