A viable logarithmic f(R) model for inflation

TL;DR

This paper proposes a new logarithmic $f(R)$ gravity model for inflation that aligns with Planck data, predicts specific spectral indices and tensor-to-scalar ratios, and naturally couples to scalar bosons for reheating.

Contribution

A novel logarithmic $f(R)$ model for inflation that satisfies viability criteria and matches observational data, including spectral index and tensor-to-scalar ratio.

Findings

Predicts scalar spectral index between 0.9615 and 0.9693

Tensor-to-scalar ratio of order 10^{-3}

Reheating temperature below 10^9 GeV

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.