Cosmic Structure Formation at High Redshift

Understand

We present some preliminary results from a series of extremely large, high-resolution N-body simulations of the formation of early nonlinear structures.

• We find that the high-z halo mass function is inconsistent with the Sheth-Tormen mass function, which tends to over-estimate the abundance of rare halos.
• This discrepancy is in rough agreement with previous results based on smaller simulations.
• We also show that the number density of minihaloes is correlated with local matter density, albeit with a significant scatter that increases with redshift, as minihaloes become increasingly rare.