We discuss baryogenesis using the flipped SU(5) model for lepton mass matrices. We show that the generalized see-saw mechanism in this model cannot only provide MSW neutrino mixing suitable for solving the solar neutrino problem, and supply a hot dark matter candidate (vτ) with mass O(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 non-perturbative 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.
Bibliographical noteFunding Information:
The work of D.V.N. was supportedin part by DOE grant DE-FG05-91-ER-40633a nd by a grant from Conoco Inc. The work of K.A.O. was supportedin part by DOE grant DE-AC02-83ER-40105a,n d by a PresidenticaYlo ung InvestigatoArw ard.