Probing the Early Universe with the SZ Effect

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Science  02 Mar 2001:
Vol. 291, Issue 5509, pp. 1715-1717
DOI: 10.1126/science.291.5509.1715

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The cosmic microwave background radiation (CMBR) is providing important clues into the evolution of the early universe. In their Perspective, Joy and Carlstrom discuss one feature of the CMBR, the Sunyaev-Zel'dovich effect, which can be used to determine the abundance and evolution of clusters of galaxies, thereby constraining key cosmological parameters such as the matter density of the universe and its expansion rate.