Neutrino mass and Dark matter

Having a neutrino component of dark matter provides the best existing model for structure formation in the universe. If at least one light sterile neutrino exists, this hot dark matter can be accommodated, along with the solar nu(e) deficit, the anomalous mu/e ratio produced by atmospheric neutrinos, and the candidate events for nu(mu) --> nu(e) (or <(nu)over bar>(mu) --> <(nu)over bar>(e)) from the LSND experiment. This neutrino mass pattern also provides a robust solution to problems presently making heavy-element synthesis by suppernovae seem impossible, and it could help resolve a possible discrepancy between big bang nucleosynthesis theory and observations.