Successful type I Leptogenesis with SO(10)-inspired mass relations

It is well-known that thermal leptogenesis through the decays of the lightest righthanded neutrinos encounters serious difficulties when SO(10)-inspired mass conditions are imposed on the Dirac neutrino mass matrix and light neutrino masses are generated through the type I see-saw mechanism. We show that these can be circumvented when the production from the next-to-lightest right-handed neutrinos and flavor effects are properly taken into account. Some conditions on the low energy parameters have to be satisfied in order for inverse processes involving the lightest right-handed neutrino not to wash-out the asymmetry. In particular we find m1 & 10 −3 eV, where m1 is the mass of the lightest left-handed neutrino and that non-vanishing values of the mixing angle θ13 are preferred in the case of a normal fully hierarchical spectrum of light neutrinos.