Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996acppb..27.1527c&link_type=abstract
Acta Phys. Pol., B, Vol. 27, No. 7, p. 1527 - 1539
Physics
Neutrinos: Oscillations, Neutrinos: Dark Matter
Scientific paper
It is increasingly likely that the universe is flat, having a critical density (Ω = 1), and probably made up of <10% baryonic matter, ⪆70% cold dark matter, and ≡20% hot dark matter. Some evidence for the last component may be coming from the LSND experiment which has observed a beam-on minus beam-off excess of events which are consistent with oscillations of ν¯μ→ν¯e. While the chance that this is a statistical fluctuation is <10-3, evidence for neutrino mass cannot be claimed unless the effect appears also in the νμ→ν¯e channel, currently being analyzed. If νμ→νe is observed also, then Δmμe2 is most likely ≡6 eV2. Should a neutrino (νμ or νe) have a mass ≡2.4 eV, then current models of a low density universe (Ω < 0.4) do not work, and a critical density universe is favored. If two nearly degenerate neutrinos exist to share the ≡20% hot dark matter, this model explains the structure of the universe. On all scales and solves the age problem, because the Hubble constant has to be close to 50 km·s-1Mpc-1. Constraints from supernova nucleosynthesis can be avoided by making mνe > mνμ, or by having νe→νs explain solar neutrinos, since the sterile neutrino may even aid nucleosynthesis.
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