Weak Lensing

The weak lensing of background galaxies by foreground mass sheets, correlated with itself (shear-shear correlations) or with foreground galaxies (sheargalaxy correlations) is sensitive to dark energy as a standard ruler and growth function probes. The DES instrument must be able to measure the weak lensing signal from large scale structure in several redshift bins with small and stable instrumental point spread functions. Large solid angle is required to probe the shear field over the largest possible range in physical scales.

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