Monday, April 1, 2013

1303.7294 (Lauren Pearce et al.)

Indirect Detection of Self-Interacting Asymmetric Dark Matter    [PDF]

Lauren Pearce, Alexander Kusenko
We explore the prospects for indirect detection of asymmetric self-interacting dark matter. The motivation for dark matter with such properties comes from the possibility to explain the observed similar abundances of dark matter and ordinary matter, as well as from a combination of astrophysical observations, including the structure of halos on galactic and subgalactic scales. Because of the lack of annihilation, one usually considers this form of dark matter a poor candidate for indirect detection. However, we show that indirect detection may, in fact, be possible if dark matter particles make bound states via the force mediating their self-interaction. Emission of the dark-force mediator particle invariably accompanies the formation of bound states, and the subsequent decays of these particles may produce an observable gamma-ray signal or an observable positron excess. We also consider bremsstrahlung of dark-force particles in scattering of dark matter particles. Due to galactic backgrounds, the bound state formation has better prospects for indirect detection than bremsstrahlung.
View original: http://arxiv.org/abs/1303.7294

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