ON THE NEUTRINO MASS, THE ABUNDANCE OF RIGHT-HANDED NEUTRINOS AND THE CLOSURE OF THE UNIVERSE
1981
It is pointed out that although the neutrino mass is finite, the left-handed neutrino density still dominates over the right-handed one in the universe unless there exists one (or more) elementary fermion (quark or lepton) whose mass is larger than 10/sup 6/ GeV or M/sub W//sub R//M/sub W//sub L/< or approx. =10/sup 2/(W/sub L/ and W/sub R/ are the left and right-handed intermediate bosons, respectively). If a neutrino has mass of approx.34 eV as indicated in some experiments, then one can conclude that the total neutrino mass should contribute about 99% to the mass of the whole universe and lead to the closure of the universe. This conclusion can be brought in to agreement with all observational data which have been obtained up to now. A mass limit of all species of neutrinos obtained by reexamining all data is summation/sub i//sup /mi-italic< or approx. =200 eV.
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