A new observable for cosmic shear

Abstract In this paper we introduce a new observable to measure cosmic shear. We show that if can with good accuracy both the orientation of galaxy and polarisation direction its radio emission, angle between them is sensitive foreground Even signal-to-noise ratio for single measurement expected be rather small, fact all galaxies in given pixel are subject same shear used overcome noise. An additional advantage signal not plagued by intrinsic alignment. estimate SNR correlation functions ζ ± ( μ,z 1 , z 2 ) measured way future SKA II survey.