Integral X-ray constraints on sub-GeV Dark Matter

Abstract

Light Dark Matter (DM), defined here as having a mass between 1 MeV and about 1 GeV, is an interesting possibility both theoretically and phenomenologically, at one of the frontiers of current progress in the field of DM searches. Its indirect detection via gamma-rays is challenged by the scarcity of experiments in the MeV-GeV region. We look therefore at lower-energy X-ray data from the Integral telescope, and compare them with the predicted DM flux. We derive bounds which are competitive with existing ones from other techniques. Crucially, we include the contribution from inverse Compton scattering on galactic radiation fields and the CMB, which leads to much stronger constraints than in previous studies for DM masses above 20 MeV.

arXiv comment16 pp+refs, 7 figs. v2: added comments on radiative decays and positron in-flight annihilation. Results unchanged. v3: comments added, on astrophysical uncertainties, on more aggressive bounds including background and on justifying adopted approximations. Results unchanged. v4: figure on astrophysical uncertainties added. Matches PRD version. v5: typo in the units of plots in fig. 2 and 3 fixed

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