Voids in a $Λ$CDM Universe

Details Voids in a $Λ$CDM Universe Voids in a $Λ$CDM Universe

2004-09-07

arxiv.org/abs/astro-ph/0409162v2

Mon.Not.Roy.Astron.Soc. 360 (2005) 216-226

Astronomy and Astrophysics

Astrophysics

12 pages, 16 figures, submitted to MNRAS; 13 pages, 17 figures, revised version, accepted for publication

Scientific paper

10.1111/j.1365-2966.2005.09064.x

We study the formation and evolution of voids in the dark matter distribution using various simulations of the popular $\Lambda$ Cold Dark Matter cosmogony. We identify voids by requiring them to be regions of space with a mean overdensity of -0.8 or less. Each of the simulations contains thousands of voids. The distribution of void sizes in the different simulations shows good agreement. Voids very clearly correspond to minima in the smoothed initial density field. We find a universal void mass profile of the form $\rho(

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