Discriminating Weak Lensing from Intrinsic Spin Correlations Using the Curl‐Gradient Decomposition
Discriminating Weak Lensing from Intrinsic Spin Correlations Using the Curl‐Gradient Decomposition
The distortion field defined by the ellipticities of galaxy shapes projected on the sky can be uniquely decomposed into a gradient and a curl component. If the observed ellipticities are induced by weak gravitational lensing, then the distortion field is curl free. Here we show that, in contrast, the distortion …