Cosmological constraints on the curvaton web parameters

TL;DR

This paper explores how a mixed inflaton-curvaton model with a large positive tilt and inhomogeneous fields can produce significant small-scale curvature perturbations, constraining parameters through primordial black hole formation.

Contribution

It introduces constraints on curvaton model parameters considering primordial black hole production in a chaotic inflation framework with supergravity corrections.

Findings

Constraints on model parameters derived from PBH production

Large non-Gaussianity at small scales

Significant small-scale curvature perturbations

Abstract

We consider the mixed inflaton-curvaton scenario in which quantum fluctuations of the curvaton field during inflation lead to a relatively large curvature perturbation spectrum at small scales. We use the model of chaotic inflation with quadratic potential including supergravity corrections leading to a large positive tilt in the power spectrum of the curvaton field. The model is characterized by the strongly inhomogeneous curvaton field in the Universe and large non-Gaussianity of curvature perturbations at small scales. We obtained the constraints on the model parameters considering the process of primordial black hole (PBH) production in radiation era.