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Cosmological structure formation predicts that our galactic halo contains anenormous hierarchy of substructures and streams, the remnants of the merginghierarchy that began with tiny Earth mass microhalos. If these structurespersist until the present time, they could influence dramatically the detectionsignatures of weakly interacting elementary particle dark matter (WIMP). Usingnumerical simulations that follow the tidal disruption within the Galacticpotential and heating from stellar encounters, we find that neither microhalosnor streams have significant impact on direct detection, implying that darkmatter constraints derived using simple smooth halo models are relativelyrobust. We also find that many dense central cusps survive, yielding a smallenhancement in the signal for indirect detection experiments.

Microhalos and Dark Matter Detection