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Dark matter is the dominant form of matter in the universe, but its nature isunknown. It is plausibly an elementary particle, perhaps the lightestsupersymmetric partner of known particle species. In this case, annihilation ofdark matter in the halo of the Milky Way should produce gamma-rays at a levelwhich may soon be observable. Previous work has argued that the annihilationsignal will be dominated by emission from very small clumps (perhaps smallereven than the Earth) which would be most easily detected where they clustertogether in the dark matter halos of dwarf satellite galaxies. Here we show,using the largest ever simulation of the formation of a galactic halo, thatsuch small-scale structure will, in fact, have a negligible impact on darkmatter detectability. Rather, the dominant and likely most easily detectablesignal will be produced by diffuse dark matter in the main halo of the MilkyWay. If the main halo is strongly detected, then small dark matter clumpsshould also be visible, but may well contain no stars, thereby confirming a keyprediction of the Cold Dark Matter (CDM) model.

A blueprint for detecting supersymmetric dark matter in the Galactic halo