Power-law F(R) gravity as deformations to Starobinsky inflation in view of ACT
Odintsov S.D. Oikonomou V.K.
November 2025Elsevier B.V.
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
2025#870
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+βRn 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.
04.50.Kd , 11.25.-w , 95.36.+x , 98.80.-k , 98.80.Cq , ACT , Cosmology , Inflation , Power-law f(R) gravity , Starobinsky deformations
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Institute of Space Sciences (ICE, CSIC) C. Can Magrans s/n, 08193, Barcelona, Spain
ICREA, Passeig Luis Companys, 23, 08010 Barcelona, Spain
Institut dEstudis Espacials de Catalunya (IEEC), 08860 Castelldefels, Barcelona, Catalonia, Spain
L.N. Gumilyov Eurasian National University - Astana, 010008, Kazakhstan
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
Institute of Space Sciences (ICE
ICREA
Institut dEstudis Espacials de Catalunya (IEEC)
L.N. Gumilyov Eurasian National University - Astana
Department of Physics
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