The hot dark matter paradox

Physics – Nuclear Physics

Scientific paper

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Scientific paper

Direct observations favor a low-mass-density universe, but a critical density universe with a neutrino component of dark matter provides the best model for explaining the observed structure of the universe over more than three orders of magnitude in distance scale. Other information requires that this be two-neutrino (νμ + ντ) dark matter, as would also be expected in the four-neutrino model which explains all present indications for neutrino mass: νμ -> ντ for the atmospheric νμ/νe ratio and νe -> νs for the solar νe deficit, with LSND's νbar μ -> νbar e observation giving the mass difference between the lighter νe - νs pair and the heavier νμ - ντ pair. The LSND/KARMEN results are consistent with the needed mass of hot dark matter, and production of heavy elements by supernovae seem to require this same four-neutrino scheme. The fascinating question is whether this hot dark matter paradox will be resolved by better measurements, or by the introduction of new physics

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