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D. Huterer (CWRU), J.A. Frieman (U. of Chicago, Fermilab), E.V. Linder (LBL), M.S. Turner (U of Chicago, Fermilab)
Type Ia supernovae (SNe) and cosmic microwave background (CMB) anisotropy are each sensitive to the dark energy equation-of-state w. SNe alone can determine w quite accurately, while CMB anisotropy alone cannot because the CMB mainly provides the distance to the last scattering surface. However, we show that a powerful CMB mission, such as Planck, can significantly improve the power of a deep SNe survey, such as SNAP, to probe w and especially dw/dz. Because CMB constraints are nearly orthogonal to SNe constraints in the \OmegaM -- w plane, for constraining w(z) Planck is more useful than precise determination of \OmegaM. We discuss how the SNAP/Planck complementarity impacts strategies for the redshift distribution of a supernova survey to determine w(z) and conclude that a well-designed sample should include a substantial number of supernovae out to redshifts z ~2. This result is independent of the assumptions about the relative cost of finding SNe at a given redshift.
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.