Large N-body simulations on parallel supercomputers allow one to simultaneously investigate large-scale structure and the formation of galactic halos with unprecedented resolution. Our study shows that the masses as well as the spatial distribution of halos on scales of tens of megaparsecs in a cold dark matter (CDM) universe with the spectrum normalized to the anisotropies detected by COBE is compatible with the observations. We also show that the average value of the relative pairwise velocity dispersion σnu_ -used as a principal argument against COBE-normalized CDM models is significantly lower for halos than for individual particles. When the observational methods of extracting σnu_ are applied to the redshift catalogs obtained from the numerical experiments, estimates differ significantly between different observation-sized samples and overlap observational estimates obtained following the same procedure.
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Zurek et al. (1994) studied this question.