Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology

Details Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology Robustness of Discrete Flows and Caustics in Cold Dark Matter Cosmology

2005-08-01

arxiv.org/abs/astro-ph/0508049v1

Phys.Rev.D72:083513,2005

Astronomy and Astrophysics

Astrophysics

13 pages, no figures

Scientific paper

10.1103/PhysRevD.72.083513

Although a simple argument implies that the distribution of dark matter in galactic halos is characterized by discrete flows and caustics, their presence is often ignored in discussions of galactic dynamics and of dark matter detection strategies. Discrete flows and caustics can in fact be irrelevant if the number of flows is very large. We estimate the number of dark matter flows as a function of galactocentric distance and consider the various ways in which that number can be increased, in particular by the presence of structure on small scales (dark matter clumps) and the scattering of the flows by inhomogeneities in the matter distribution. We find that, when all complicating factors are taken into account, discrete flows and caustics in galactic halos remain a robust prediction of cold dark matter cosmology with extensive implications for observation and experiment.

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