WIMP Dark Matter from Gravitino Decays and Leptogenesis

Understand

The spontaneous breaking of B-L symmetry naturally accounts for the small observed neutrino masses via the seesaw mechanism.

• We have recently shown that the cosmological realization of B-L breaking in a supersymmetric theory can successfully generate the initial conditions of the hot early universe, i.e.
• entropy, baryon asymmetry and dark matter, if the gravitino is the lightest superparticle (LSP).
• This implies relations between neutrino and superparticle masses.