Abstract
The atmospheric neutrino data reported at this meeting strongly suggests neutrino oscillation, while the situation with the solar neutrino data is becoming more and more convincing as well. Both suggest tiny but finite neutrino masses. I first review why such neutrino masses are closely related to baryon-number violation in the early Universe. I also present a simple scheme of baryogenesis, the Minimal Supersymmetric Leptogenesis, which generates the baryon asymmetry of desired order of magnitude with the mass range suggested by atmospheric and solar neutrino data, but not with the Hot Dark Matter (HDM) mass range. Finally I point out a dark horse HDM candidate (hadronic axion) which may be testable by SuperKamiokande with a galactic supernova.
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