Using the Cannon-Ball model's original priors, the author computes a positron source spectrum whose shape matches AMS data, with an absolute normalization 23% higher than observed.
Dark Matter Signals In Cosmic Rays?
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abstract
The flux of the diffuse gamma-ray background radiation (GBR) does not confirm that the excess in the flux of cosmic ray electrons between 300-800 GeV, which was measured locally with the ATIC instrument in balloon flights over Antartica, is universal as expected from dark matter annihilation. Neither does the increase with energy of the fraction of positrons in the cosmic ray flux of electrons in the 10-100 GeV range that was measured by PAMELA imply a dark matter origin: It is consistent with that expected from the sum of the two major sources of Galactic cosmic rays, non relativistic spherical ejecta and highly relativistic jets from supernova explosions.
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Deciphering the AMS cosmic-ray positron flux
Using the Cannon-Ball model's original priors, the author computes a positron source spectrum whose shape matches AMS data, with an absolute normalization 23% higher than observed.