Physics – Nuclear Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994nuphs..35..134c&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 35, p. 134-136.
Physics
Nuclear Physics
Scientific paper
There is increasing evidence that more than 90% of the mass of the universe is in an unseen, non-baryonic form. The model of this dark matter which best fits the structure of the universe on all scales is a mixture of ~ 70% cold dark matter and ~ 30% neutrinos of ~ 7 eV. If the solar νe and atmospheric νμ deficits both result from neutrino mass, these three mass requirements allow only three possible patterns of neutrino mass: (A) νe, νμ, and ντ are all 2-3 eV; (B) the νe, νμ, and ντ are all very light, and a sterile neutrino νs is the component of dark matter; or (C) the νe and νs are light, and the νμ and ντ are 3-4 eV. Neutrinoless double beta decay should constrain (A) for the much more likely Majorana masses, but recent preliminary data make this an interesting possibility. (B) is unlikely because νs would decouple early, reducing its number density, forcing up its mass so much that it would no longer be hot dark matter. There is no problem with (C), for which the solar νe deficit is explained by νe --> νs, with nucleosynthesis constraints being obeyed for the non-adiabatic MSW and vacuum oscillation cases, which have almost the same parameters as for νe --> νs. Both (A) and (C) can be tested in the near future.
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