Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-05-22
PoSTRIESTE99:008,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 2 figures (included), uses JHEP.cls (included), talk given at the Trieste Meeting of the TMR Network on Physics Beyon
Scientific paper
Two moderate extensions of the minimal supersymmetric standard model are considered. The first one includes a U(1)_{B-L} gauge group, while the second is based on a left-right symmetric gauge group. In these models, hybrid inflation is `naturally' realized and the mu problem is solved via a Peccei-Quinn symmetry. Baryon number conservation is an automatic consequence of a R-symmetry. The baryon asymmetry of the universe is generated through a primordial leptogenesis. In the `B-L' case, neutrinos are assumed to acquire degenerate masses equal to about 1.5 eV by coupling to SU(2)_L triplet superfields, thereby providing the hot dark matter of the universe. In the `left-right' model, light neutrinos acquire hierarchical masses by the seesaw mechanism. They are taken from the small angle MSW resolution of the solar neutrino puzzle and the SuperKamiokande data. Maximal nu_{mu}-nu_{tau} mixing, implied by the same data, is easily accommodated. The gravitino and baryogenesis constraints can be satisfied, in both models, with more or less `natural' values of the relevant coupling constants.
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