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Abstract:
In recent years standard cold dark matter (CDM) theory, which enjoyed a large following throughout much of the past decade, has been abandoned by virtually all of its early supporters. The most serious argument against CDM was the incompatibility between the relatively high value of the pairwise radial velocity dispersion between galaxies, oe v, inferred from numerical simulation with the much lower observational estimates. We reexamine this argument in the light of our new, high-resolution, COBE-normalized simulations and conclude that oe v is significantly overestimated in simulations which do not have sufficient resolution (i.e., which have masses of galaxies comparable to the mass of N-body particles) and that it is also difficult to reliably estimate oe v from the observational catalogues used for this purpose. We conclude that inflationary cosmology and CDM are not--- contrary to the presently prevailing prejudice--- incompatible with the observations of small scale peculiar velocities, as characterized, for example, by oe v. 1
Citations
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| 8 | Large scale structure after COBE: Peculiar velocities and correlations of cold dark matter halos – Zurek, Quinn, et al. - 1994 |
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