Mimetic $F(R)$ inflation confronted with Planck and BICEP2/Keck Array data

TL;DR

This paper shows that mimetic $F(R)$ gravity models can produce cosmologies compatible with recent observational data, especially in terms of scalar to tensor ratio, by providing specific examples with low ratios.

Contribution

It introduces mimetic $F(R)$ gravity with Lagrange multiplier as a viable framework to match recent cosmological observations, demonstrating its potential through concrete examples.

Findings

Models can produce low scalar to tensor ratios compatible with observations

Some examples predict ratios significantly below observational upper limits

The approach offers a new way to reconcile modified gravity with data

Abstract

In this paper we demonstrate that in the context of mimetic $F(R)$ gravity with Lagrange multiplier, it is possible to realize cosmologies which are compatible with the recent BICEP2/Keck Array data. We provide some characteristic examples for which the predicted scalar to tensor ratio can be quite smaller in comparison to the upper limit imposed by the BICEP2/Keck Array observations.