Curvature Perturbation from Supersymmetric Flat Directions

TL;DR

This paper proposes that flat directions in supersymmetric models can generate the total curvature perturbation during the early universe's oscillation phase, potentially leading to observable non-Gaussianity.

Contribution

It introduces a novel mechanism where supersymmetric flat directions contribute to curvature perturbations at the first oscillation, highlighting a link to non-Gaussianity.

Findings

Flat directions can generate curvature perturbations during oscillation.

Significant non-Gaussianity may result if this contribution dominates.

The mechanism connects supersymmetry with observable cosmological signatures.

Abstract

We show that a contribution to the total curvature perturbation may be due to the presence of flat directions in supersymmetric models. It is generated at the first os- cillation of the flat direction condensate when the latter relaxes to the minimum of its potential after the end of inflation. We also point out that, if the contribution to the total curvature perturbation from supersymmetric flat direction is the dominant one, then a significant level of non-Gaussianity in the cosmological perturbation is also naturally expected.