Tensor-to-Scalar Ratio in Eddington-inspired Born-Infeld Inflation

TL;DR

This paper analyzes scalar perturbations in Eddington-inspired Born-Infeld inflation, showing that the tensor-to-scalar ratio is reduced compared to standard chaotic inflation, with implications for observational predictions.

Contribution

It introduces the effects of Eddington-inspired Born-Infeld gravity on inflationary perturbations, highlighting modifications to the tensor-to-scalar ratio.

Findings

Scalar perturbations show corrections to chaotic inflation in GR.

Tensor-to-scalar ratio is smaller than in standard chaotic inflation.

Results have implications for inflationary observational constraints.

Abstract

We investigate the scalar perturbation of the inflation model driven by a massive-scalar field in Eddington-inspired Born-Infeld gravity. We focus on the perturbation at the attractor stage in which the first and the second slow-roll conditions are satisfied. The scalar perturbation exhibits the corrections to the chaotic inflation model in general relativity. We find that the tensor-to-scalar ratio becomes smaller than that of the usual chaotic inflation.