Abstract
Caustics are formally singular structures that frequently form in collisionless media. The non-negligible velocity dispersion of dark matter particles renders their density finite. We evaluated the maximum density of the caustics within the framework of secondary infall model of formation of dark matter haloes. The result is then used to demonstrate that caustics can be probed by properly stacking the weak-lensing signal of about 600 haloes. CFHTLS accompanied by X-ray observations and the space-based experiments like SNAP or DUNE can provide us with the required statistics. The extension of our results to more realistic models including the effects of mergers is outlined.
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