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)
IllustrationFor illustration: solid (dotted) curves with (without) half-life effects.Number of events per year: pink1.11.7Dim and remote observability of keV sterile neutrino DM in this way:--- tiny active-sterile neutrino mixing angles (main problem)--- background: keV solar neutrinos or scattering.
Summary----- CB: a test of cosmology as early as t ~ 1 s after theBig Bang, but a direct measurement is extremely difficult.----- Weinberg’s idea works in principle, but in practice itsuffers from small target mass, low number density, …..e.g., KATRIN’s tritium mass 0.1 mg, toooooo small----- Sterile ’s as hot dark matter (sub-eV) might not beimpossible, and they could be detected in the same way.----- Cosmic anti- background could also be detected byusing the same idea and EC-decaying nuclei as the target.In practice, this seems more difficult.----- Warm dark matter in the form of keV sterile ’s maybe detected in the same way, but it is more challenging!
- Page 1 and 2: Neutrinos as Hot or Warm Dark Matte
- Page 3 and 4: Sub-eV or keV Neutrinos?A purely ph
- Page 5 and 6: As T ~ a few MeV in the Universe, t
- Page 7 and 8: CB Must Be ThereToday’s matter &
- Page 9 and 10: ExampleSalient feature: the cross s
- Page 11 and 12: Cosmic anti-Background?Overdensitie
- Page 13 and 14: Hamann et al, arXiv:1006.5276; 1108
- Page 15 and 16: OverdensitiesGravitational clusteri
- Page 17 and 18: keV sterile Dark MatterThere is no
- Page 19 and 20: keV sterile Dark MatterProduction:
- Page 21: Detection in the LabThe same method
Summary----- CB: a test of cosmology <strong>as</strong> early <strong>as</strong> t ~ 1 s after theBig Bang, but a direct me<strong>as</strong>urement is extremely difficult.----- Weinberg’s idea w<strong>or</strong>ks in principle, but in practice itsuffers from small target m<strong>as</strong>s, low number density, …..e.g., KATRIN’s tritium m<strong>as</strong>s 0.1 mg, toooooo small----- <strong>Sterile</strong> ’s <strong>as</strong> hot dark matter (sub-eV) might not beimpossible, and they could be detected in the same way.----- Cosmic anti- background could also be detected byusing the same idea and EC-decaying nuclei <strong>as</strong> the target.In practice, this seems m<strong>or</strong>e difficult.----- <strong>Warm</strong> dark matter in the f<strong>or</strong>m of keV sterile ’s maybe detected in the same way, but it is m<strong>or</strong>e challenging!
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