Hilltop Sneutrino Hybrid Inflation

TL;DR

This paper proposes a supersymmetric hilltop sneutrino hybrid inflation model where the right-handed sneutrino acts as the inflaton, fitting observational data without fine-tuning and exploring nonthermal leptogenesis.

Contribution

It introduces a novel hilltop inflation model using the right-handed sneutrino as the inflaton, aligning with observations and discussing leptogenesis mechanisms.

Findings

Achieves spectral index n_s=0.96 matching observations

No fine-tuning required for model parameters

Briefly explores nonthermal leptogenesis processes

Abstract

In this work, we consider a hilltop version of the (supersymmetric) sneutrino hybrid inflation where the right-handed sneutrino field plays the role of the inflaton field. This model is a type III hilltop inflation that can produce a spectral index $n_s=0.96$ which fits perfectly to experimental observations without fine-tuning of parameters. We also briefly consider nonthermal leptogenesis via the decay of the right-handed sneutrino inflaton field after inflation.