Cosmic microwave background anisotropy power spectrum statistics for high precision cosmology

Abstract

As the era of high precision cosmology approaches, the empirically determined power spectrum of the microwave background anisotropy, $C_l$, will provide a crucial test for cosmological theories. We present a unified semi-analytic framework for the study of the statistical properties of the $C_l$ coefficients computed from the results of balloon, ground based, and satellite experiments. An illustrative application shows that commonly used approximations {\it bias} the estimation of the baryon parameter ${\Omega }_b$ at the 1% level even for a satellite capturing as much as $\sim 70$% of the sky.

4 pages, 3 figures. Also available at http://www.tac.dk/~wandelt/downloads.html

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