Very large scale structure in an open cosmology of cold dark matter and baryons

Details Very large scale structure in an open cosmology of cold dark matter and baryons Very large scale structure in an open cosmology of cold dark matter and baryons

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..539b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 539-550. Research supported by the University of Ca

Statistics

Computation

55

Astronomical Models, Baryons, Dark Matter, Galactic Clusters, Galactic Evolution, Computational Astrophysics, Random Processes, Red Shift

Scientific paper

The 'standard' cosmology of cold dark matter (CDM) in a flat universe with Gaussian, scale-invariant fluctuations, which is so successful in explaining the major properties of galaxies and their clustering on moderate scales, fails to account for the observed clustering of clusters and streaming velocities on scales of 30-100/h Mpc. Assuming that these observations are being interpreted correctly, an open Friedmann model where CDM and baryons contribute comparably to the mean mass density is considered. In this model the CDM is responsible for galaxy formation, while the presence of the baryons induces a large-scale feature in the spectrum of fluctuations at the precombination Jeans mass, giving rise to structure on very large scales. Using linear analysis and simulations based on the Zeldovich approximation, the resultant cluster-cluster correlation function and mean streaming velocity are found to be compatible with the observations.

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