Curvaton Dynamics in Brane-worlds

TL;DR

This paper investigates the behavior of the curvaton field in various brane-world cosmological models, analyzing how it can generate density perturbations and constrain model parameters.

Contribution

It extends curvaton reheating mechanisms to Randall-Sundrum and curvature-corrected brane-world models, providing new constraints on parameters for successful cosmology.

Findings

Constraints on model parameters for successful curvaton reheating

Lower fundamental five-dimensional mass possible with curvaton-generated perturbations

Suppression of short-wavelength gravitational waves in these models

Abstract

We study the curvaton dynamics in brane-world cosmologies. Assuming that the inflaton field survives without decay after the end of inflation, we apply the curvaton reheating mechanism to Randall-Sundrum and to its curvature corrections: Gauss-Bonnet, induced gravity and combined Gauss-Bonnet and induced gravity cosmological models. In the case of chaotic inflation and requiring suppression of possible short-wavelength generated gravitational waves, we constraint the parameters of a successful curvaton brane-world cosmological model. If density perturbations are also generated by the curvaton field then, the fundamental five-dimensional mass could be much lower than the Planck mass