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Leptogenesis Below the Davidson-Ibarra Bound

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arxiv hep-ph/0603043 v2 pith:QKIX564R submitted 2006-03-06 hep-ph

Leptogenesis Below the Davidson-Ibarra Bound

classification hep-ph
keywords boundleptogenesisuniverseanchorasymmetrybaryonbelowconundrum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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