Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336l..51s&link_type=abstract
Astrophysical Journal (ISSN 0004-637X), vol. 336, Jan. 15, 1989, p. L51-L54.
Astronomy and Astrophysics
Astrophysics
42
Annihilation Reactions, Antiprotons, Astronomical Spectroscopy, Cosmic Rays, Dark Matter, Electron-Positron Pairs, Gamma Rays, Kinetic Energy, Monte Carlo Method, Particle Collisions
Scientific paper
The spectrum of antiprotons from dark matter annihilation are calculated using the Lund Monte Carlo program, and simple analytic expressions for the spectrum and low-energy antiproton/proton ratio are derived. Comparing the results with recent upper limits on low energy antiprotons, it is concluded that the reported 4-13 GeV antiproton flux cannot be accounted for by dark matter annihilation. The new upper limits do not provide useful constraints on dark matter particles. They restrict the annihilation rate and imply that annihilation gamma ray and e(+) fluxes would be far below the fluxes produced by cosmic-ray collisions. It may be possible to look for a dark matter halo annihilation signal at antiprotons energies below 0.5 GeV, where the flux from cosmic-ray collisions is expected to be negligible.
Stecker Floyd W.
Tylka Allan J.
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