Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.297..379t&link_type=abstract
Nature, vol. 297, June 3, 1982, p. 379-381.
Astronomy and Astrophysics
Astrophysics
27
Antiprotons, Black Holes (Astronomy), Cosmic Rays, Radiation Sources, Annihilation Reactions, Astronomical Models, Astrophysics
Scientific paper
The possibility is explored that primordial black holes (PBHs) of mass about 10 to the 13th up to 10 to the 15th g which evaporated after decoupling are the primary source of cosmic ray antiprotons. Three models are discussed wherein the antiprotons are radiated sufficiently late in the Universe that they avoid annihilation, leading to a universal abundance of antiprotons/protons of about 10 to the -4 down to 10 the -8. The number density of PBHs must be within a factor of about 10,000 of the upper limit allowed by the gamma-ray background constraint. The mass spectrum of PBHs can have an index in the range 2-3.75. In two of the models discussed, intergalactic antiprotons must penetrate the galactic magnetosphere to become cosmic rays. In the third model, the cosmic rays antiprotons are produced by 10 to the 15th g PBHs which are evaporating today.
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