Mutated hybrid inflation in $f(R,{\Box}R)$-gravity

TL;DR

This paper introduces a new hybrid inflation model within $f(R,{ox}R)$-gravity, showing it resembles large-field chaotic inflation and constrains its parameters using inflationary observables.

Contribution

It proposes a novel hybrid inflation scenario in $f(R,{ox}R)$-gravity with a modified waterfall field condition, linking it to large-field chaotic inflation.

Findings

The scalar potential resembles Linde's large-field chaotic inflation.

Inflationary observables constrain the model's parameter space.

A limit on the number of e-folds N is derived.

Abstract

A new hybrid inflationary scenario in the context of $f(R,{\Box}R)$-gravity is proposed. Demanding the waterfall field to 'support the potential from below' [unlike the original proposal by Stewart in Phys. Lett. B345, 414 (1995)], we demonstrate that the scalar potential is similar to that of the large-field chaotic inflation model proposed by Linde in Phys. Lett. B129, 177 (1983). Inflationary observables are used to constrain the parameter space of our model; in the process, an interesting limit on the number of e-folds N is found.