Abstract
We study the evolution of bias in four cosmological models (ΛCDM, OCDM, τCDM, and SCDM). The use of very high-resolution simulations, achieved with the AP3M code, produces dozens of galaxy-size halos inside groups. The groups look like real groups of galaxies. The bias decreases monotonically with redshift for all models and varies from 2 to 3 at z=3.0 on 1 Mpc/h scale for halos with a number density of 0.02 h3 Mpc-3. All models are anti-biased (b<1) at z<1.
