Positron line radiation as a signature of particle dark matter in the halo

Details Positron line radiation as a signature of particle dark matter in the halo Positron line radiation as a signature of particle dark matter in the halo

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..42.1001t&link_type=abstract

Physical Review D (Particles and Fields), Volume 42, Issue 4, 15 August 1990, pp.1001-1007

Astronomy and Astrophysics

Astronomy

92

Cosmic Rays, Supersymmetric Partners Of Known Particles, Particle-Theory And Field-Theory Models Of The Early Universe, Observational Cosmology

Scientific paper

We suggest a new signature for particle dark-matter annihilation in the halo: high-energy, positron line radiation. Because the cosmic-ray positron spectrum falls rapidly with energy and the contribution of conventional sources is only expected to be about 5% of the cosmic-ray electron flux, monoenergetic e+'s from halo annihilations can be a significant and distinctive signal for very massive dark-matter particles (masses greater than about 30 GeV). If the e+e- annihilation channel has an appreciable branch-a few percent or more-the e+ signal could be observable in a future detector, such as have been proposed for ASTROMAG. A significant e+e- branching ratio can occur for neutralinos or Dirac neutrinos. In spite of the fact that a heavy Dirac neutrino is no longer an attractive dark-matter candidate and the fact that the e+e- branching ratios expected for the currently popular models of the neutralino are very small, the positron signature is so distinctive that we believe it is worthy of note: If seen, it is a ``smoking gun'' for particle dark matter in the halo. We also note that the positron signature will be of general importance for any future particle dark-matter candidate whose annihilation into e+e- is not suppressed.

Affiliated with

Also associated with

No associations

Rating

Positron line radiation as a signature of particle dark matter in the halo does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Positron line radiation as a signature of particle dark matter in the halo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positron line radiation as a signature of particle dark matter in the halo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1129769