Caustics in Dark Matter Haloes

Details Caustics in Dark Matter Haloes Caustics in Dark Matter Haloes

2005-10-19

arxiv.org/abs/astro-ph/0510575v2

Astronomy and Astrophysics

Astrophysics

Minor changes, two references added, 6 pages, 3 figures, to appear in Proc. 21st IAP Colloquium "Mass Profiles and Shapes of C

Scientific paper

10.1051/eas:2006039

Caustics are formally singular structures, with infinite density, that form in collisionless media. The non-negligible velocity dispersion of dark matter particles renders their density finite. We evaluate 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 and hence a way of distinguishing between the viable dark matter particle candidates. The extension of our results to more realistic models including the effects of mergers of haloes is briefly outlined.

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