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arXiv · 1512.09324

A viable logarithmic f(R) model for inflation

M. Amin·S. Khalil·M. Salah
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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.

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M. Amin, S. Khalil, M. Salah. 2015-12-31. A viable logarithmic f(R) model for inflation. https://doi.org/10.1088/1475-7516%2F2016%2F08%2F043

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