Neutrinos as Hot or Warm Dark Matter (Active + Sterile)
Neutrinos as Hot or Warm Dark Matter (Active + Sterile)
Neutrinos as Hot or Warm Dark Matter (Active + Sterile)
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Sub-eV <strong>Sterile</strong> ’s?BBN: current data only allow one sub-eV sterile neutrino;CMB: current data can allow two sub-eV sterile neutrinos.BBNG. Mangano,P. Serpico,arXiv:1103.1261(95% C.L.)The sharp cut-offis due to a He-4abundance upperbound (