Non-thermal leptogenesis with strongly hierarchical right handed neutrinos
Abstract
Assuming the Dirac-type neutrino masses mD are related to quark or charged lepton masses, neutrino oscillation data indicate that right handed neutrino masses are in general strongly hierarchical. In particular, if mD is similar to the up-type quark masses, the mass of the lightest right handed neutrino M1<~106 GeV. We show that non-thermal leptogenesis by inflaton decay can yield sufficient baryon asymmetry despite this constraint, and discuss how the asymmetry is correlated with the low energy neutrino masses and CP-violating phases.
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