Universal properties of dark matter halos.
We discuss the universal relation between density and size of observed dark matter halos that was recently shown to hold on a wide range of scales, from dwarf galaxies to galaxy clusters. Predictions of cold dark matter (ΛCDM) N-body simulations are consistent with this relation. We demonstrate that this property of ΛCDM can be understood analytically in the secondary infall model. Qualitative understanding given by this model provides a new way to predict which deviations from ΛCDM or large-scale modifications of gravity can affect universal behavior and, therefore, to constrain them observationally.
Boyarsky
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Ecole Polytechnique Fédérale de Lausanne, FSB/ITP/LPPC, BSP 720, CH-1015, Lausanne, Switzerland.
Neronov
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A
Ruchayskiy
O
O
Tkachev
I
I