Leptogenesis in supersymmetric hybrid inflation.

The non-supersymmetric as well as the supersymmetric hybrid inflationary model is reviewed. The scenario of baryogenesis via a primordial leptogenesis is discussed and the rôle of the non-perturbative electroweak sphaleron effects is analyzed in detail. A supersymmetric model based on a left-right symmetric gauge group, which ‘naturally' leads to hybrid inflation, is presented. The μ problem is solved, in this model, and the baryon asymmetry of the universe is produced through leptogenesis. For masses of νμ, ντ from the small angle MSW resolution of the solar-neutrino problem and super-Kamiokande, maximal νμ−ντ mixing can be achieved. The required values of the relevant parameters are, however, quite small. [ABSTRACT FROM AUTHOR]