Resurrection of Grand Unified Theory Baryogenesis

Abstract

A `new' scenario is proposed for baryogenesis. We show that delayed decay of coloured Higgs particles in grand unified theories may generate excess baryon number of the empirically desired amount, if the mass of the heaviest neutrino is in the range $0.02\mathrm{eV}<m_{{\nu }_3}<0.8\mathrm{eV}$, provided that neutrinos are of the Majorana type. The scenario accommodates the case of degenerate neutrino masses, in contrast to the usual leptogenesis scenario, which does not work when three neutrino masses are degenerate.

8 pages, Latex

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• CMB Observables and Their Cosmological Implications
• Chern-Simons Number Diffusion and Hard Thermal Loops on the Lattice
• Limits on Neutrino Mass from Cosmic Structure Formation

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