Supersymmetric hybrid inflation with a light scalar

TL;DR

This paper investigates a supersymmetric hybrid inflation model incorporating a light scalar field, demonstrating that its predicted primordial perturbations align with Planck observations through analytical and numerical analysis.

Contribution

It introduces a supersymmetric hybrid inflation model with a symmetry-protected light scalar, analyzing its observable signatures and compatibility with current data.

Findings

Primordial amplitude within observational bounds

Spectral index compatible with Planck data

Non-Gaussianity parameter fNL within limits

Abstract

Light scalar fields present during inflation can lead to interesting observable signatures, especially in models with non-equilibrium reheating dynamics. We study a supersymmetric hybrid inflation model with a third scalar whose lightness is protected by symmetry, using analytical and numerical techniques, and demonstrate that the amplitude, the spectral index and the non-Gaussianity parameter fNL of the primordial curvature perturbation are within the Planck observational bounds for suitable parameter values.