New dark matter candidate: nonthermal sterile neutrinos.

Details New dark matter candidate: nonthermal sterile neutrinos. New dark matter candidate: nonthermal sterile neutrinos.

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phrvl..82.2832x&link_type=abstract

Physical Review Letters, Vol. 82, No. 14, p. 2832 - 2835

Physics

Dark Matter: Neutrinos, Dark Matter: Cosmology

Scientific paper

The authors propose a new and unique dark matter candidate: ≡100 eV to ≡10 keV sterile neutrinos produced via lepton number - driven resonant Mikheyev - Smirnov - Wolfenstein conversion of active neutrinos. The requisite lepton number asymmetries in any of the active neutrino flavors range from 10-3 to 10-1 of the photon number. The unique feature is that the adiabaticity condition of the resonance strongly favors the production of lower energy sterile neutrinos. The resulting nonthermal (cold) energy spectrum can cause these sterile neutrinos to revert to nonrelativistic kinematics at an early epoch, so that free streaming lengths at or below the dwarf galaxy scale are possible. Therefore, the main problem associated with light neutrino dark matter can be circumvented in the present model.

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