Abstract
Cold dark matter haloes are populated by caustics, which are yet to be resolved inN-body simulations or observed in the Universe. The secondary infall model provides aparadigm for the study of caustics in typical haloes assuming that they have had no majormergers and have grown only by smooth accretion. This is a particular characteristic of thesmallest dark matter haloes of about , which although atypical contain no substructures and could have survived until now withno major mergers. Thus using this model as the first guideline, we evaluate the neutralinoself-annihilation flux for these haloes. Our results show that caustics could leave a distinctsawteeth signature on the differential and cumulative fluxes coming from the outer regionsof these haloes. The total annihilation signal from the regions away from the centre can beboosted by about 40%.
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