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Recent results of neutrino oscillation experiments point to a nonvanishingneutrino mass. Neutrino mass models favour Majorana-type neutrinos. In suchcircumstances it is natural that the supersymmetric counterpart of theneutrino, the sneutrino, bears also lepton number violating properties. On theother hand, the fact that the universe exhibits an asymmetry in the baryon andantibaryon numbers poses constraints on the extent of lepton number violationin the light sneutrino sector if the electroweak phase transition is second orweak first order. From the requirement that the Baryon Asymmetry of theUniverse should not be washed out by sneutrino induced lepton number violatinginteractions and sphalerons below the critical temperature of the electroweakphase transition we find that the mass splitting of the light sneutrino massstates is compatible with the sneutrino Cold Dark Matter hypothesis only forheavy gauginos and opposite sign gaugino mass parameters.Comment: 13 pages, 4 figure

Light lepton number violating sneutrinos and the baryon number of the universe