Astrophysical Signatures of Secluded Dark Matter

Details Astrophysical Signatures of Secluded Dark Matter Astrophysical Signatures of Secluded Dark Matter

2008-10-08

arxiv.org/abs/0810.1502v2

Phys.Lett.B671:391-397,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 2 figures; v2: references added

Scientific paper

10.1016/j.physletb.2008.12.012

We analyze the indirect astrophysical signatures of secluded models of WIMP dark matter, characterized by a weak-scale rate for annihilation into light MeV-scale mediators which are metastable to decay into Standard Model states. Such scenarios allow a significant enhancement of the annihilation cross section in the galactic halo relative to its value at freeze-out, particularly when the mediator is light enough for this process to proceed through radiative capture to a metastable `WIMP-onium' bound state. For MeV-scale vector mediators charged under a hidden U(1)' gauge group, the enhanced annihilation rate leads predominantly to a sizable excess positron flux, even in the absence of astrophysical boost factors.

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