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We consider a minimal supersymmetric extension of the Standard Model, withright-handed neutrinos and local B-L, the difference between baryon and leptonnumber, a symmetry which is spontaneously broken at the scale of grandunification. To a large extent, the parameters of the model are determined bygauge and Yukawa couplings of quarks and leptons. We show that this minimalmodel can successfully account for the earliest phases of the cosmologicalevolution: Inflation is driven by the energy density of a false vacuum ofunbroken B-L symmetry, which ends in tachyonic preheating, i.e. the decay ofthe false vacuum, followed by a matter dominated phase with heavy B-L Higgsbosons. Nonthermal and thermal processes produce an abundance of heavyneutrinos whose decays generate primordial entropy, baryon asymmetry vialeptogenesis and dark matter consisting of gravitinos or nonthermal WIMPs. Themodel predicts relations between neutrino and superparticle masses and acharacteristic spectrum of gravitational waves.

A Minimal Supersymmetric Model of Particle Physics and the Early Universe