Neutrinos as Hot or Warm Dark Matter

Details Neutrinos as Hot or Warm Dark Matter Neutrinos as Hot or Warm Dark Matter

2011-10-11

arxiv.org/abs/1110.2293v2

Acta Phys. Polon. B 42, 2193 (2011)

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 5 figures, references updated, published in Acta Phys. Polon. B 42, 2193 (2011)

Scientific paper

Both active and sterile sub-eV neutrinos can serve for hot dark matter (DM). On the other hand, keV sterile neutrinos could be a good candidate for warm DM. The beta-decaying (e.g., H-3 and Ru-106) and EC-decaying (e.g., Ho-163) nuclei are considered as the most promising targets to capture those extremely low energy neutrinos and antineutrinos, respectively. We calculate the capture rates of relic electron neutrinos and antineutrinos against the corresponding beta-decay or EC-decay backgrounds in different flavor mixing schemes. We stress that such direct laboratory measurements of hot or warm DM might not be hopeless in the long term.

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