Constraints on Ωm and σ8 in the base ΛCDM model from DES galaxy lensing (green), Planck CMB lensing (grey), and the joint constraint (red). The Planck power-spectrum constraint is shown in blue. Here, we adopt cosmological parameter priors consistent with the CMB lensing-only analysis, which differ from the priors assumed by the DES collaboration (Troxel et al. 2018). The odd shape of the DES lensing and joint contours is due to a non-trivial degeneracy with the intrinsic alignment parameters, giving a region of parameter space with large negative intrinsic alignment amplitudes that cannot be excluded by current lensing data alone (but is reduced by different choices of cosmological parameter priors; see PCP18). Contours contain 68% and 95% of the probability.
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