Baryogenesis by R-parity violating top quark decays and   neutron-antineutron oscillations
  Generation of the cosmological baryon asymmetry in SUSY based model with broken R-parity and low scale gravity is considered. The model allows for a long-life time or even stable proton and observable neutron-antineutron oscillations. 
A.D. Dolgov, F.R. Urban