Baryogenesis through lepton number violation
Abstract
Description
The most promising scenarios of baryogenesis seems to be the one through lepton number violation. Lepton number violation through a Majarana mass of the right-handed neutrinos can generate a lepton asymmetry of the universe when the right-handed neutrinos decay. The left-handed neutrinos get small Majorana masses through see-saw mechanism in these models. A triplet higgs scalar violating lepton number explicitly through its couplings to two leptons or two higgs doublets can also naturally give small Majorana masses to the left-handed neutrinos and also generate a lepton asymmetry of the universe. We review both these models of leptogenesis, where the lepton number asymmetry then gets converted to a baryon asymmetry of the universe before the electroweak phase transition.
12 pages latex file with iopconf.sty and three postscript figures (to appear in Second Int Conf on Dark Matter in Astro and Particle Physics, July 20-25, Heidelberg, Germany, 1998)
12 pages latex file with iopconf.sty and three postscript figures (to appear in Second Int Conf on Dark Matter in Astro and Particle Physics, July 20-25, Heidelberg, Germany, 1998)