Curvaton decay into relativistic matter

TL;DR

This paper explores a curvaton model where decay into relativistic fluids leads to dark matter formation, analyzing thermodynamics, non-gaussianity, and parameter constraints in the early universe.

Contribution

It introduces a three-fluid curvaton decay model with detailed analysis of thermodynamics and non-gaussianity, highlighting parameter constraints and naturalness considerations.

Findings

Parameter space is strongly constrained by cosmological conditions.

The model naturally produces dark matter from relativistic decay.

Non-gaussianity generation depends on decay dynamics.

Abstract

We consider an inflationary curvaton scenario, where the curvaton decays into two non-interacting relativistic fluids and later during the cosmological evolution one of them becomes non-relativistic, forming dark matter component of the universe. We study the thermic properties and the generation of non-gaussianity in this three fluid curvaton model. By solving the evolution of the system and using several cosmological conditions we find that the allowed parameter space is strongly constrained. The naturalness of this curvaton scenario is also discussed.