Cosmological constant, COBE cosmic microwave background anisotropy, and large-scale clustering

Details Cosmological constant, COBE cosmic microwave background anisotropy, and large-scale clustering Cosmological constant, COBE cosmic microwave background anisotropy, and large-scale clustering

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413....1k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 1-9.

Astronomy and Astrophysics

Astronomy

127

Dark Matter, Galactic Structure, Globular Clusters, Infrared Astronomy Satellite, Relic Radiation, Anisotropy, Normal Density Functions, Power Spectra

Scientific paper

A flat, scale-free, low-density cold dark matter model with a positive cosmological constant is one of the surviving scenarios after the COBE discovery of large-scale anisotropy in the cosmic background radiation. We calculate the expected properties of the model when normalized to the anisotropy measured by COBE, for various large-scale structure observations: the CfA and IRAS galaxy power spectra, the galaxy peculiar velocities, the bulk-flow motion, the APM galaxy angular correlation function, and the cluster mass function. Several effects due to the cosmological constant and properties of primordial fluctuations from inflation are taken into account. A flat model with Omega(h) of about 0.25-0.3 is consistent with all the above large-scale structure observations; Omega(h) equal to or greater than 0.3-0.4 is also consistent with the observed age of the globular clusters and a galaxy bias of about 1.5. The streaming velocity test fits the data at the 1.6 sigma level and appears to be a critical test for the model.

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