Polynomial Chaotic Inflation in Supergravity Revisited

TL;DR

This paper reexamines a polynomial chaotic inflation model in supergravity, confirming its validity and consistency with observational parameters like spectral index and tensor-to-scalar ratio, despite recent criticisms.

Contribution

The authors validate the polynomial chaotic inflation model in supergravity by detailed inflaton dynamics analysis, addressing prior concerns and confirming the model's applicability.

Findings

Inflaton potential well approximated by polynomial form

Spectral index and tensor-to-scalar ratio estimations are reliable

Model remains consistent with observational data

Abstract

We revisit a polynomial chaotic inflation model in supergravity which we proposed soon after the Planck first data release. Recently some issues have been raised in Ref.[12], concerning the validity of our polynomial chaotic inflation model. We study the inflaton dynamics in detail, and confirm that the inflaton potential is very well approximated by a polynomial potential for the parameters of our interest in any practical sense, and in particular, the spectral index and the tensor-to-scalar ratio can be estimated by single-field approximation. This justifies our analysis of the polynomial chaotic inflation in supergravity.