CDM/baryon isocurvature perturbations in a sneutrino curvaton model

TL;DR

This paper investigates a sneutrino curvaton model that generates matter isocurvature perturbations, which are constrained by observations, and demonstrates how the model can reduce these perturbations and improve agreement with cosmic microwave background data.

Contribution

The paper introduces a sneutrino curvaton model where CDM and baryon isocurvature perturbations compensate, reducing total matter isocurvature and improving observational consistency.

Findings

Total matter isocurvature perturbations are reduced due to compensation.

The model suppresses large-scale temperature anisotropies.

It aligns better with cosmic microwave background observations.

Abstract

Matter isocurvature perturbations are strictly constrained from cosmic microwave background observations. We study a sneutrino curvaton model where both cold dark matter (CDM)/baryon isocurvature perturbations are generated. In our model, total matter isocurvature perturbations are reduced since the CDM/baryon isocurvature perturbations compensate for each other. We show that this model can not only avoid the stringent observational constraints but also suppress temperature anisotropies on large scales, which leads to improved agreement with observations.