A New Dark Matter Candidate: Non-thermal Sterile Neutrinos

Details A New Dark Matter Candidate: Non-thermal Sterile Neutrinos A New Dark Matter Candidate: Non-thermal Sterile Neutrinos

1998-10-06

arxiv.org/abs/astro-ph/9810076v3

Phys.Rev.Lett. 82 (1999) 2832-2835

Astronomy and Astrophysics

Astrophysics

Latex 11 pages + 1 figure

Scientific paper

10.1103/PhysRevLett.82.2832

We propose a new and unique dark matter candidate: $\sim 100$ eV to $\sim 10$ keV sterile neutrinos produced via lepton number-driven resonant MSW (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 - well within primordial nucleosynthesis bounds. The unique feature here is that the adiabaticity condition of the resonance strongly favors the production of lower energy sterile neutrinos. The resulting non-thermal (cold) energy spectrum can cause these sterile neutrinos to revert to non-relativistic 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 candidates can be circumvented in our model.

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