Halo abundances and shear in void models

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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.
OriginalsprogEngelsk
TidsskriftPhysics of the Dark Universe
Vol/bind1
Udgave nummer1-2
Sider (fra-til)24-31
Antal sider8
ISSN2212-6864
DOI
StatusUdgivet - nov. 2012

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