The Absence of the Integrated Sachs-Wolfe Effect: Constraints on a Cosmological Constant

Details The Absence of the Integrated Sachs-Wolfe Effect: Constraints on a Cosmological Constant The Absence of the Integrated Sachs-Wolfe Effect: Constraints on a Cosmological Constant

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..666...67b&link_type=abstract

THE EMERGENCE OF COSMIC STRUCTURE: Thirteenth Astrophysics Conference. AIP Conference Proceedings, Volume 666, pp. 67-70 (2003)

Astronomy and Astrophysics

Astrophysics

4

Observational Cosmology, Background Radiations, Superclusters, Large-Scale Structure Of The Universe

Scientific paper

The hard X-ray background (XRB) provides a tracer of matter out to a redshift of z ~= 4. If the universe is open or has a significant cosmological constant, then the cosmic microwave background (CMB) and XRB should be correlated due to the integrated Sachs-Wolfe (ISW) effect. A comparison of the COBE CMB map with HEAO1 A2 2-10 keV map of the XRB shows no such correlation. If the X-ray bias factor is on the order of 2-3 as implied by the clustering of the XRB, the implied 95% CL upper limit on a cosmological constant is ΩΛ <~ 0.60.

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