Can scalar neutrinos or massive Dirac neutrinos be the missing mass?
Abstract
Scalar neutrinos and massive Dirac neutrinos in the mass range 2-20 GeV have been proposed as candidates to provide the dark matter in the halo of our galaxy. If so, the particles are captured inthe Earth with an efficiency of 10-10 - 10-7. For Dirac neutrinos more massive than about 9 GeV and scalar neutrinos more massive than abour 12 GeV, enough are captured to produce an observable neutrino flux at the surface of the Earth (~ 10-2 cm-2 s-1 for sneutrinos and ~ 1.4 × 10-3 cm-2 s-1 for Dirac neutrinos), several orders of magnitude above atmospheric background and above what is observed. Hence stable scalar neutrinos of mass 12-20 GeV or Dirac neutrinos of mass 9-20 GeV cannot be the dominant component of the halo.
I wish to thank Josh Frieman, Lawrence Hall, John Losecco, Keith Olive, Bill Press, Dave Spergel, and Frank Wilczek for helpful dicussions.- Publication:
-
Physics Letters B
- Pub Date:
- February 1986
- DOI:
- 10.1016/0370-2693(86)90349-7
- Bibcode:
- 1986PhLB..167..295F