ar X iv : 0 71 2 . 27 93 v 2 [ he p - ph ] 1 8 D ec 2 00 7 B − L Conserved Baryogenesis
نویسنده
چکیده
In the presence of anomaly induced sphaleron process, only a B − L asymmetry can be partially converted to the baryon asymmetry while any B+L asymmetry would be completely erased. Thus in any successful baryogenesis theories, B−L is usually violated above the electroweak scale to explain the observed matter-antimatter asymmetry of the universe. However, if any lepton asymmetry is not affected by the sphaleron processes, a B −L conserved theory can still realize the baryogenesis. We present here an SU(5) GUT realization of this scenario, which naturally accommodates small masses of Dirac neutrinos.
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