Non-Minimal Sneutrino Inflation, Peccei-Quinn Phase Transition and non-Thermal Leptogenesis

TL;DR

This paper explores a supersymmetric inflation model driven by a sneutrino, linking it to solutions for the strong CP and mu problems, and demonstrating how non-thermal leptogenesis can produce the observed baryon asymmetry.

Contribution

It introduces a novel scenario combining non-minimal sneutrino-driven inflation with a Peccei-Quinn phase transition and non-thermal leptogenesis, constrained by observational data.

Findings

Inflaton mass constrained below 10^12 GeV.

Effective Yukawa couplings are relatively small.

Model consistent with current cosmological and particle physics constraints.

Abstract

We consider a phenomenological extension of the minimal supersymmetric standard model which incorporates non-minimal chaotic inflation, driven by a quartic potential associated with the lightest right-handed sneutrino. Inflation is followed by a Peccei-Quinn phase transition based on renormalizable superpotential terms, which resolves the strong CP and mu problems of the minimal supersymmetric standard model provided that one related parameter of the superpotential is somewhat small. Baryogenesis occurs via non-thermal leptogenesis, which is realized by the inflaton decay. Confronting our scenario with the current observational data on the inflationary observables, the baryon assymetry of the universe, the gravitino limit on the reheating temperature and the upper bound on the light neutrino masses, we constrain the effective Yukawa coupling involved in the decay of the inflaton to relatively small values and the inflaton mass to values lower than 10^12 GeV.