  We study tachyonic preheating associated with the spontaneous breaking of
B-L, the difference of baryon and lepton number. Reheating occurs through the
decays of heavy Majorana neutrinos which are produced during preheating and in
decays of the Higgs particles of B-L breaking. Baryogenesis is an interplay of
nonthermal and thermal leptogenesis, accompanied by thermally produced
gravitino dark matter. The proposed mechanism simultaneously explains the
generation of matter and dark matter, thereby relating the absolute neutrino
mass scale to the gravitino mass.
