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Title: The second coming of cold dark matter?

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, {sigma}{sub 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 {sigma}{sub 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 {sigma}{sub 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 {sigma}{sub v}.
Authors:
;  [1] ;  [2] ;  [3]
  1. Los Alamos National Lab., NM (United States)
  2. Mt. Stromlo Observatory, PB Weston Creek, Canberra, ACT (Australia)
  3. Caltech Concurrent Supercomputing Facility, Pasadena, CA (United States)
Publication Date:
OSTI Identifier:
10113653
Report Number(s):
LA-UR--93-4240; CONF-9311156--1
ON: DE94004992
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Cosmic velocity fields,Paris (France),Nov 1993; Other Information: PBD: [1993]
Research Org:
Los Alamos National Lab., NM (United States)
Sponsoring Org:
Department of Defense, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; NONLUMINOUS MATTER; COSMOLOGICAL MODELS; VELOCITY; COMPUTERIZED SIMULATION 661300; OTHER ASPECTS OF PHYSICAL SCIENCE