Regular Article - Theoretical Physics
Constant-roll inflation in modified gravity model using Palatini formalism
Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh, India
Accepted: 2 April 2023
Published online: 17 April 2023
In this work, we study a constant-roll inflationary model in the Palatini formalism using modified gravity. Here our action consists a non-minimal coupling of a scalar field with Ricci scalar R in a general form of . Using Palatini approach, we write its equivalent scalar-tensor form in the Einstein frame and then apply the constant-roll condition in the equation of motion for the inflaton field. Later the tensor-to-scalar ratio and the spectral index are calculated using the slow-roll parameters and the results obtained are matched with the Planck 2018 data. We found that the results agree nicely with the observations within the parameter regime under consideration.
© The Author(s) 2023
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