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Sterile neutrino hot, warm, and cold dark matter Kevork Abazajian,

Summary: Sterile neutrino hot, warm, and cold dark matter
Kevork Abazajian,
George M. Fuller,
and Mitesh Patel
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319
(Dated: January 30, 2001)
We calculate the incoherent resonant and non-resonant scattering production of sterile neu-
trinos in the early universe. We find ranges of sterile neutrino masses, vacuum mixing angles,
and initial lepton numbers which allow these species to constitute viable hot, warm, and cold
dark matter (HDM, WDM, CDM) candidates which meet observational constraints. The con-
straints considered here include energy loss in core collapse supernovae, energy density limits
at big bang nucleosynthesis, and those stemming from sterile neutrino decay: limits from ob-
served cosmic microwave background anisotropies, diffuse extragalactic background radiation,
and 6
Li/D overproduction. Our calculations explicitly include matter effects, both effective mix-
ing angle suppression and enhancement (MSW resonance), as well as quantum damping. We
for the first time properly include all finite temperature effects, dilution resulting from the an-
nihilation or disappearance of relativistic degrees of freedom, and the scattering-rate-enhancing
effects of particle-antiparticle pairs (muons, tauons, quarks) at high temperature in the early


Source: Abazajian, Kev - Theoretical Astrophysics, Fermilab


Collections: Physics