We evaluate the constraints that the COBE observations put on baryogenesis in inflationary cosmologies. We consider the supersymmetric version of the proposal of Fukugita and Yanagida, that the baryon asymmetry of the universe is created by nonperturbative electroweak reprocessing of a lepton asymmetry generated in the decay of heavy right handed see-saw (s)neutrinos. We review our recent proposal of a mechanism for baryogenesis via sphaleron reprocessing of a lepton asymmetry generated by (s)neutrino mass effects on flat direction scalar condensate oscillations. Finally we analyze in detail the implementation of these mechanisms in the recently proposed ansatze for fermion mass matrices in supersymmetric, unified, theories.
Bibliographical noteFunding Information:
We thank M.-K. Gaillard, Marcus Luty, Lawrence Hall and Mark Srednicki for very helpful discussions. The work of B.A.C. and S.D. was supported in part by the Natural Sciences and Engineering Research council of Canada. The work of K.A.O. was supported in part by DOE grant DE-ACO2-83ER-40105, and by a Presidential Young Investigator Award. B.A.C. and K.A.O. would like to thank the CERN Theory Division for kind hospitality during part of this research.