Omega_m - Different Ways to Determine the Matter Density of the Universe

Abstract

A summary of various measurements of the mean matter density in the universe, Omega_m, is presented. Results from very different kinds of methods using various astronomical objects -- from supernovae to large-scale structure -- are shown. There is a remarkable preference for Omega_m values around 0.3, but there are also some measurements that favour a higher or a smaller value.

Invited Review to be published in the Space Sciences Series of ISSI, Vol. 15, and in Space Science Reviews, P. Jetzer, K. Pretzl, R. von Steiger (eds.), Kluwer, 12 pages

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• Galaxy Cluster Gas Mass Fractions from Sunyaev-Zel'dovich Effect Measurements: Constraints on Omega_M
• The ROSAT-ESO Flux-Limited X-Ray (REFLEX) Galaxy Cluster Survey III: The Power Spectrum
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