Microhalos and Dark Matter Detection

Details Microhalos and Dark Matter Detection Microhalos and Dark Matter Detection

2011-05-20

arxiv.org/abs/1105.4106v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Conference proceedings from Identification of Dark Matter 2010, Montpellier, France

Scientific paper

Cosmological structure formation predicts that our galactic halo contains an enormous hierarchy of substructures and streams, the remnants of the merging hierarchy that began with tiny Earth mass microhalos. If these structures persist until the present time, they could influence dramatically the detection signatures of weakly interacting elementary particle dark matter (WIMP). Using numerical simulations that follow the tidal disruption within the Galactic potential and heating from stellar encounters, we find that neither microhalos nor streams have significant impact on direct detection, implying that dark matter constraints derived using simple smooth halo models are relatively robust. We also find that many dense central cusps survive, yielding a small enhancement in the signal for indirect detection experiments.

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