A no-go theorem for the dark matter interpretation of the positron   anomaly
  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. 
Maxim Laletin
astro-ph.HE hep-ph