Can scalar neutrinos or massive Dirac neutrinos be the missing mass?

Details Can scalar neutrinos or massive Dirac neutrinos be the missing mass? Can scalar neutrinos or massive Dirac neutrinos be the missing mass?

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phlb..167..295f&link_type=abstract

Physics Letters B, Volume 167, Issue 3, p. 295-300.

Physics

140

Scientific paper

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.

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