2007/07/31 by M. Kachelriess, M. Kachelrieß, P. D. Serpico +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.76.063516
published as Phys.Rev.D76:063516,2007 · 4 pages revtex, 2 figures; minor changes, references added, conclusions unchanged; Matches published version
openalex publication_date 2007/09/28 · arxiv created 2007/09/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
An upper limit on the total annihilation cross section of dark matter (DM) has recently been derived from the observed atmospheric neutrino background. We show that comparable bounds are obtained for DM masses around the TeV scale by observations of the diffuse gamma-ray flux by EGRET, because electroweak bremsstrahlung leads to non-negligible electromagnetic branching ratios, even if DM particles only couple to neutrinos at tree level. A better mapping and the partial resolution of the diffuse gamma-ray background into astrophysical sources by the GLAST satellite will improve this bound in the near future.