A no-go theorem for the dark matter interpretation of the positron anomaly

Abstract

The overabundance of high-energy cosmic positrons, observed by PAMELA and AMS-02, can be considered as the consequence of dark matter decays or annihilations. We show that recent FERMI/LAT measurements of the isotropic diffuse gamma-ray background impose severe constraints on dark matter explanations and make them practically inconsistent.

Comments: 5 pages, 4 figures; talk given at the 5th Young Researchers Workshop "Physics Challenges in the LHC Era", Frascati, May 9 and 12, 2016