The curvaton scenario in the MSSM and predictions for non-Gaussianity

TL;DR

This paper presents a model where both the inflaton and curvaton originate from the MSSM, leading to rapid thermalization and potential observable non-Gaussianities without residual isocurvature perturbations.

Contribution

It introduces a unified MSSM-based framework for inflaton and curvaton, predicting significant non-Gaussianity linked to Standard Model parameters.

Findings

No residual isocurvature perturbations due to quick thermalization.

Predicts observable non-Gaussianity with $f_{NL}$ between 5 and 1000.

Non-Gaussianity depends on weak-scale physics and Yukawa couplings.

Abstract

We provide a model in which both the inflaton and the curvaton are obtained from within the minimal supersymmetric Standard Model, with known gauge and Yukawa interactions. Since now both the inflaton and curvaton fields are successfully embedded within the same sector, their decay products thermalize very quickly before the electroweak scale. This results in two important features of the model: firstly, there will be no residual isocurvature perturbations, and secondly, observable non-Gaussianities can be generated with the non-Gaussianity parameter $f_\mathrm{NL}\sim {\cal O}(5-1000)$ being determined solely by the combination of weak-scale physics and the Standard Model Yukawas.