Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-02-03
Phys.Rev. D48 (1993) 1546-1554
Physics
High Energy Physics
High Energy Physics - Phenomenology
uses harvmac.tex, epsf.tex, and tables.tex; 4 figures submitted as tar-compressed-uuencoded postscript files; beautiful compre
Scientific paper
10.1103/PhysRevD.48.1546
Cosmological constraints on grand unified theories with spontaneous lepton number violation are analysed. We concentrate on $SO(10)$, the simplest of the models possessing this property. It has been noted previously that the consistency of these models with the observed baryon asymmetry generically implies strict upper bounds on the light neutrino masses. In this paper, we analyze the situation in detail. We find that minimal models of fermion masses face difficulties, but that it is possible for these models to generate an adequate baryon asymmetry via non-equilibrium lepton number violating processes when the right-handed neutrino masses are near their maximum possible values. This condition uniquely picks out the minimal gauge symmetry breaking scheme. A non-minimal model is also analyzed, with somewhat different conclusions due to the nature of the imposed symmetries.
Gherghetta Tony
Jungman Gerard
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