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 $N_1$, 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 $N_1$ and the upper bound on the reheating temperature of the Universe after inflation. A modest resolution of this conundrum is proposed.

7 pages, 1 figure

References in corpus (1)

• Flavoured leptogenesis: a successful thermal leptogenesis with N_1 mass below 10^8 GeV