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arXiv · hep-ph/9812454

Degenerate Neutrinos and Supersymmetric Inflation

G. Lazarides
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Abstract

A moderate extension of the minimal supersymmetric standard model which includes a U(1)_(B-L) gauge group (B and L being the baryon and lepton number) and a Peccei-Quinn symmetry, U(1)_PQ, is presented. The hybrid inflationary scenario is automatic and `natural' in this model. The mu problem of the minimal supersymmetric standard model is solved by coupling the electroweak higgses to fields which break U(1)_PQ. Baryon number conservation and, thus, proton stability are automatic consequences of a R-symmetry. Neutrinos are assumed to acquire degenerate masses of about 1.5 eV by coupling to SU(2)_L triplet superfields, thereby providing the hot dark matter of the universe. The inflaton decays into these triplets which, via their subsequent decay, produce a primordial lepton asymmetry later converted into the observed baryon asymmetry of the universe. The gravitino and baryogenesis constraints can be satisfied with `natural' values (of order 10^{-3}) of the relevant coupling constants.

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G. Lazarides. 1999-05-22. Degenerate Neutrinos and Supersymmetric Inflation. https://doi.org/10.1016/s0370-2693(99)00285-3

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