Nonlinearities in modified gravity cosmology. II. Impacts of modified gravity on the halo properties

Understand

The statistics of dark matter halos is an essential component of understanding the nonlinear evolution in modified gravity cosmology.

• Based on a series of modified gravity N-body simulations, we investigate the halo mass function, concentration and bias.
• We model the impact of modified gravity by a single parameter \zeta, which determines the enhancement of particle acceleration with respect to GR, given the identical mass distribution (\zeta=1 in GR).
• We select snapshot redshifts such that the linear matter power spectra of different gravity models are identical, in order to isolate the impact of gravity beyond modifying the linear growth rate.