Note on the dark matter explanation of the ARCADE excess and AMS data

Abstract

In this paper we show that positron data from AMS seems to rule out the explanation of the ARCADE isotropic radio background excess in terms of self-annihilating dark matter. In earlier works it was found that leptonic annihilation channels of light dark matter provide a good fit to the excess due to synchrotron emission of the final state particles. However, limits on the self-annihilation cross-section derived from the positron data of AMS now severely constrain light self-annihilating dark matter and cross-sections below that of a thermal relic are already tested for leptonic annihilation channels. Combining these two results, we conclude that an explanation of the excess in the radio background in terms of self-annihilating dark matter is excluded.

arXiv comment3 pages, 3 figures, references added, matches published version

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Cited by in corpus (2)

• WIMP dark matter candidates and searches - current status and future prospects
• The Anisotropy of the Extragalactic Radio Background from Dark Matter Annihilation