NEUTRINO DARK MATTER WITH A GALACTIC-RANGE NEW FORCE

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Abstract
We propose a new force of the galactic range acting among massive neutrinos to weaken the phase space constraint for the neutrino dark halo. As a consequence we find that the neutrino with mass 10 eV becomes a candidate for the galaxy dark halo to explain the observed flat rotation curves. Cosmological consequence of the new force is briefly discussed. It is, furthermore, pointed out that the new force can be naturally incorporated into the see-saw model for the neutrino mass.

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