Leptogenesis in Supersymmetric Hybrid Inflation

TL;DR

This paper reviews hybrid inflation models, discusses leptogenesis as a mechanism for baryogenesis, and presents a supersymmetric model that naturally incorporates hybrid inflation and explains the baryon asymmetry.

Contribution

It introduces a supersymmetric left-right symmetric model that naturally leads to hybrid inflation and successfully generates baryon asymmetry via leptogenesis.

Findings

Maximal nu_mu-nu_tau mixing achievable with small parameters.

The model solves the mu problem.

Baryon asymmetry produced through leptogenesis.

Abstract

The nonsupersymmetric as well as the supersymmetric hybrid inflationary model is reviewed. The scenario of baryogenesis via a primordial leptogenesis is discussed and the role of the nonperturbative electroweak sphaleron effects is analyzed. A supersymmetric model based on a left-right symmetric gauge group, which `naturally' leads to hybrid inflation, is presented. The mu problem is solved, in this model, and the baryon asymmetry of the universe is produced through leptogenesis. For masses of nu_mu, nu_tau from the small angle MSW resolution of the solar neutrino problem and SuperKamiokande, maximal nu_mu-nu_tau mixing can be achieved. The required values of the relevant parameters are, however, quite small.