Non-Gaussianity and gravitational wave background in curvaton with a double well potential

TL;DR

This paper investigates how a curvaton with a double well potential influences non-Gaussianity and gravitational wave background, highlighting the dependence on self-coupling and reheating temperature.

Contribution

It introduces a detailed analysis of non-Gaussianity and gravitational waves in a double well curvaton model, emphasizing differences from standard models.

Findings

Nonlinear parameters depend on self-coupling and reheating temperature.

Predictions show significant variation from usual massive curvaton models.

The model provides new insights into non-Gaussianity and gravitational wave amplitude.

Abstract

We study the density perturbation by a curvaton with a double well potential and estimate the nonlinear parameters for non-Gaussianity and the amplitude of gravitational wave background generated during inflation. The predicted nonlinear parameters strongly depend on the size of a curvaton self-coupling constant as well as the reheating temperature after inflation for a given initial amplitude of the curvaton. The difference from usual massive self-interacting curvaton is also emphasized.