A viable logarithmic f(R) model for inflation

Abstract

Inflation in the framework of $f(R)$ modified gravity is revisited. We study the conditions that $f(R)$ should satisfy in order to lead to a viable inflationary model in the original form and in the Einstein frame. Based on these criteria we propose a new logarithmic model as a potential candidate for $f(R)$ theories aiming to describe inflation consistent with observations from \textit{Planck} satellite (2015). The model predicts scalar spectral index $0.9615<n_s<0.9693$ in agreement with observation and tensor-to-scalar ratio $r$ of order $10^{-3}$. Furthermore, we show that for a class of models, a natural coupling between inflation and a scalar boson is generated through the minimal coupling between gravity and matter fields and a reheating temperature less that $10^9$ GeV is obtained.

16 pages, 5 figures

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• Canonical Scalar Field Inflation with a Woods-Saxon Potential
• The inflationary scenario in the $f(R)$ gravity model with a $R^4$ term
• A note on inflation in dRGT massive gravity
• Inflation constraints for classes of f(R) models
• Constraining $f(R)$ model through spectral indices and reheating temperature