Halo abundances and shear in void models

Details Halo abundances and shear in void models Halo abundances and shear in void models

2012-04-16

arxiv.org/abs/1204.3532v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 3 figures, Submitted to Phys. Rev. D, preprint IFT-UAM/CSIC-12-31

Scientific paper

We study the non-linear gravitational collapse of dark matter into halos through numerical N-body simulations of Lemaitre-Tolman-Bondi void models. We extend the halo mass function formalism to these models in a consistent way. This extension not only compares well with the simulated data at all times and radii, but it also gives interesting clues about the impact of the background shear on the growth of perturbations. Our results give hints about the possibility of constraining the background shear via cluster number counts, which could then give rise to strong constraints on general inhomogeneous models, of any scale.

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