Inflation using a triplet of Antisymmetric tensor fields

TL;DR

This paper proposes an inflation model driven by a triplet of antisymmetric tensor fields, demonstrating that such a setup can support inflation with inherent background isotropy and analyzing the perturbations and gravitational wave spectra.

Contribution

It introduces a novel inflation model using a triplet of antisymmetric tensor fields with minimal and nonminimal gravity couplings, ensuring isotropy and detailed perturbation analysis.

Findings

Inflation supported by triplet antisymmetric tensor fields with nonminimal couplings.

Tensor perturbations yield a tunable gravitational wave speed.

Calculated power spectrum and tensor spectral index of gravitational waves.

Abstract

We study an inflation model driven by a triplet of antisymmetric tensor fields, with minimal and nonminimal couplings to gravity. First, we show that the presence of a triplet of antisymmetric tensor fields can provide inherent background isotropy in the stress-energy tensor contrary to the past studies using an antisymmetric tensor field. Inflation is supported in the presence of non-minimal couplings with gravity. We perform the slow roll analysis and also analyse perturbations to the antisymmetric tensor field as well as the tensor modes of perturbed metric. The speed of gravitational waves manifested from the tensor perturbations is tuned to $c$. We also study the evolution of the gravitational waves, calculate their power spectrum and tensor spectral index.