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)
Detection of CBWay 1: CB-induced mechanical effects on Cavendish-type torsion balance;Way 2: Capture of relic ’s on radioactive -decaying nuclei (Weinberg 62);Way 3: Z-resonance annihilation of UHE cosmic ’s and relic ’s (Weiler 82).Temperature todayRelic neutrino capture on -decaying nucleiMean momentum todayAt least 2 ’s cold todayHow to detect ULE ’s ?(Irvine & Humphreys, 83) no energy threshold on incident ’s mono-energetic outgoing electrons
ExampleSalient feature: the cross section of a capture reaction scales withso that the number of events converges to a constant for :e.g.(Cocco et al 07, Lazauskas et al 08).Capture rate: (1 MCi = 100 g =tritium atoms)Background: (the tritium -decay)Energy resolution (Gaussian function) :
- 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: CB Must Be ThereToday’s matter &
- 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 and 22: Detection in the LabThe same method
- Page 23 and 24: Summary----- CB: a test of cosmolog
Detection of CBWay 1: CB-induced mechanical effects on Cavendish-type t<strong>or</strong>sion balance;Way 2: Capture of relic ’s on radioactive -decaying nuclei (Weinberg 62);Way 3: Z-resonance annihilation of UHE cosmic ’s and relic ’s (Weiler 82).Temperature todayRelic neutrino capture on -decaying nucleiMean momentum todayAt le<strong>as</strong>t 2 ’s cold todayHow to detect ULE ’s ?(Irvine & Humphreys, 83) no energy threshold on incident ’s mono-energetic outgoing electrons
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