Inverse Compton constraints on the Dark Matter e+e- excesses
arXiv:0904.3830 · doi:10.1016/j.nuclphysb.2009.06.034
Abstract
Recent results from experiments like PAMELA have pointed to excesses of e+e- in cosmic rays. If interpreted in terms of Dark Matter annihilations, they imply the existence of an abundant population of e+e- in the galactic halo at large. We consider the high energy gamma ray fluxes produced by Inverse Compton scattering of interstellar photons on such e+e-, and compare them with the available data from EGRET and some preliminary data from FERMI. We consider different observation regions of the sky and a range of DM masses, annihilation channels and DM profiles. We find that large portions of the parameter space are excluded, in particular for DM masses larger than 1 TeV, for leptonic annihilation channels and for benchmark Einasto or NFW profiles.
18 pages, 4 figures; v2: Comments and References added; v3: typos and numbers in Table 1 corrected, matches version published on NPB