Cosmological Inflation in a Generalized Unimodular Gravity

Abstract

We study some aspects of cosmological inflation in the framework of unimodular $f(R)$ gravity. To be more clarified, we consider a generic $f(R)$ of the type $f(R)=R+\alpha R^n$. By considering Einstein frame counterpart of the unimodular $f(R)$ gravity, we set the scalaron to be responsible for cosmological inflation in this setup. We confront our model parameters space with observational data and impose some constraints on the value of $n$ in this manner. We show that for the number of e-folds $N=60$, the model is consistent with observation if $1.89<n<1.918$.

arXiv comment14 pages, 2 figures

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Cited by in corpus (2)

• Unimodular Einstein--Cartan gravity: Dynamics and conservation laws
• What do gravitons say about (unimodular) gravity?