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Abstract: We discuss combining gravitational lensing of galaxies and the cosmicmicrowave background CMB by clusters to measure cosmographic distance ratios,and hence dark energy parameters. Advantages to using the CMB as the secondsource plane, instead of galaxies, include: a well-determined source distance,a longer lever arm for distance ratios, typically up to an order of magnitudehigher sensitivity to dark energy parameters, and a decreased sensitivity tophotometric redshift accuracy of the lens and galaxy sources. Disadvantagesinclude: higher statistical errors, potential systematic errors, and the needfor disparate surveys that overlap on the sky. Ongoing and planned surveys,such as the South Pol Telescope in conjunction with the Dark Energy Survey, canpotentially reach the statistical sensitivity to make interesting consistencytests of the standard cosmological constant model. Future measurements thatreach 1% or better precision in the convergences can provide sharp tests forfuture supernovae distance measurements.

Autor: Wayne Hu KICP, U Chicago, Daniel E. Holz LANL, Chris Vale FNAL


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