Inflationary Tensor Perturbation in Eddington-inspired Born-Infeld gravity

TL;DR

This paper studies tensor perturbations during inflation in Eddington-inspired Born-Infeld gravity, revealing unique long-wavelength features that could impact cosmic microwave background observations.

Contribution

It introduces the analysis of tensor perturbations in Eddington-inspired Born-Infeld gravity during inflation, highlighting distinctive long-wavelength behavior.

Findings

Short wavelength modes resemble chaotic inflation perturbations.

Long wavelength modes show a rise in power spectrum.

Potential signatures in cosmic microwave background radiation.

Abstract

We investigate the tensor perturbation in the inflation model driven by a massive-scalar field in Eddington-inspired Born-Infeld gravity. For short wave-length modes, the perturbation feature is very similar to that of the usual chaotic inflation. For long wave-length modes, the perturbation exhibits a peculiar rise in the power spectrum which may leave a signature in the cosmic microwave background radiation.