A dark matter interpretation for the ARCADE excess?

Details A dark matter interpretation for the ARCADE excess? A dark matter interpretation for the ARCADE excess?

2011-08-02

arxiv.org/abs/1108.0569v2

Phys.Rev.Lett. 107 (2011) 271302

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures. v2: one benchmark model added, comments and references expanded, to appear in PRL

Scientific paper

10.1103/PhysRevLett.107.271302

The ARCADE 2 Collaboration has recently measured an isotropic radio emission which is significantly brighter than the expected contributions from known extra-galactic sources. The simplest explanation of such excess involves a "new" population of unresolved sources which become the most numerous at very low (observationally unreached) brightness. We investigate this scenario in terms of synchrotron radiation induced by WIMP annihilations or decays in extragalactic halos. Intriguingly, for light-mass WIMPs with thermal annihilation cross-section, and fairly conservative clustering assumptions, the level of expected radio emission matches the ARCADE observations.

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