Leptogenesis Below the Davidson-Ibarra Bound
Abstract
The observed baryon asymmetry of the Universe is suitably created in thermal leptogenesis through the out-of-equilibrium decay of N1, the lightest of the three heavy singlet neutral fermions which anchor the seesaw mechanism to obtain small Majorana neutrino masses. However, this scenario suffers from the incompatibility of a generic lower bound on the mass of N1 and the upper bound on the reheating temperature of the Universe after inflation. A modest resolution of this conundrum is proposed.
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