Leptogenesis and neutrino parameters - art. no. 073007

We calculate the baryonic asymmetry of the universe in the baryogenesis-via -leptogenesis framework, assuming first a quark-lepton symmetry and then a charged-neutral lepton symmetry. We match the results with the experimental ly favored range. In the first case all the oscillation solutions to the so lar neutrino problem, except the large mixing matter solution, can lead to the allowed range, but with fine-tuning of the parameters. In the second ca se the general result is quite similar. Some related theoretical hints are discussed.