On the abundance of collapsed objects
Astrophysics
2016-08-30 v2
Abstract
The redshift dependence of the abundance of collapsed objects places strong constraints on cosmological models of structure formation. We apply a recently proposed model describing the anisotropic collapse of inhomogeneous spatial domains. Compared with the spherical top-hat model, this generic model leads to significantly more collapsed objects at high redshifts: at redshift one and on the scale of rich clusters a factor of 65. Furthermore, for a fixed normalization of the initial fluctuation spectrum (\sigma_8=1), we predict four times as much presently collapsed objects on the mass-scale of rich clusters within the standard CDM cosmogony, compared to the spherical collapse.
Cite
@article{arxiv.astro-ph/0007284,
title = {On the abundance of collapsed objects},
author = {Martin Kerscher and Thomas Buchert and Toshifumi Futamase},
journal= {arXiv preprint arXiv:astro-ph/0007284},
year = {2016}
}
Comments
4 pages, 2 figures, revised version accepted in the ApJL