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Asantha R. Cooray (University of Chicago)
The number density evolution of galaxy clusters has now been used as a cosmological probe to determine the mass density of the Universe. We introduce a Fisher matrix approach to such studies and quantify the expected errors in the determination of the cosmological parameters. It is suggested that the number counts out to a redshift of 1 from a 1000 sqr. deg. survey sensitive to massive clusters, with temperatures greater than 7 keV, can be used to determine the mass density better than 10% at the 95% confidence level. Such a survey should now be possible based on X-ray emission, Sunyaev-Zel'dovich effect, or gravitational lensing. We also study the cosmological applications of future cluster catalogs from the Sloan Digital Sky Survey at optical wavelengths, and from ground-based interferometers and Planck satellite through observations of the Sunyaev-Zel'dovich effect.
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