Flipped Heavy Neutrinos from the Solar Neutrino Problem to Baryogenesis

Details Flipped Heavy Neutrinos from the Solar Neutrino Problem to Baryogenesis Flipped Heavy Neutrinos from the Solar Neutrino Problem to Baryogenesis

1992-11-27

arxiv.org/abs/hep-ph/9211325v1

Phys.Lett.B300:121-127,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 1 figure not included, CERN-TH.6712/92

Scientific paper

10.1016/0370-2693(93)90758-A

We discuss baryogenesis using the flipped $SU(5)$ model for lepton mass matrices. We show that the generalized see-saw mechanism in this model can not only provide MSW neutrino mixing suitable for solving the solar neutrino problem, and supply a hot dark matter candidate ($\nu_\tau$) with mass $0(10)eV$ as indicated by recent COBE results, but can also naturally account for the baryon asymmetry of the universe. Heavy singlet neutrino decay generates a net lepton asymmetry which is subsequently reprocessed by nonperturbative electroweak interactions. We evaluate the baryon asymmetry so produced in light of the constraints that the COBE observations put on inflationary cosmologies, finding it comfortably consistent with observation.

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