... density

See e.g. Donato et al. (2004) for the antiproton flux and Bertone & Merritt (2005) for a general recent review.

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... clusters

$\sim$5 per square degree, (Hennawi & Spergel 2005).

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... factor

Hereafter, velocity dispersion is given at the present time, z=0. For instance, neutralinos have $\sigma\sim 0.03$ cm s^-1 and axions have $\sigma\sim 10^{-7}$ cm s^-1.

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