Cosmic complementarity: combining CMB and supernova observations

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We compute the accuracy with which Omega and Lambda can be measured by combining future SN Ia and CMB experiments, deriving a handy expression for the SN Ia Fisher information matrix. The two data sets are found to be highly complementary: a joint analysis reduces the error bars by more than an order of magnitude compared to a separate analysis of either data set.
Figure labels added. 4 pages, to appear in "Fundamental parameters in Cosmology", Rencontres de Moriond. Color figures and links at http://www.sns.ias.edu/~max/complementarity.html (faster from the US), from http://www.mpa-garching.mpg.de/~max/complementarity.html (faster from Europe) or from max@ias.edu

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