Right-Handed Sneutrino Curvaton and non-Gaussianity

TL;DR

This paper investigates the parameter space of a Right-Handed sneutrino curvaton model capable of producing significant non-Gaussianity, highlighting the role of Yukawa couplings and braneworld scenarios.

Contribution

It provides a detailed analysis of the conditions under which a RH sneutrino curvaton can generate large non-Gaussianity without specific inflation assumptions.

Findings

Small Yukawa couplings are generally required for success.

Larger Yukawa couplings are possible in braneworld scenarios.

Discussion on spectral index implications in the curvaton scenario.

Abstract

In this paper, we explore the parameter space for a Right-Handed (RH) sneutrino curvaton that can generate large non-Gaussianity without assuming any particular inflation sector. The mass of the RH sneutrino is suggested from a discussion on the initial condition of the curvaton field. It is shown that a small Yukawa coupling is generally required for a successful RH sneutrino curvaton. However, the Yukawa coupling can be larger if we consider the braneworld scenario. Some general discussion about the spectral index in curvaton scenario is also provided.