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Weak gravitational lensing is one of the key probes of cosmology. Cosmicshear surveys aimed at measuring the distribution of matter in the universe arecurrently being carried out (Pan-STARRS) or planned for the coming decade (DES,LSST, EUCLID, WFIRST). Crucial to the success of these surveys is the controlof systematics. In this work a new method to constrain one such family ofsystematics, known as multiplicative bias, is proposed. This method exploitsthe cross-correlation between weak lensing measurements from galaxy surveys andthe ones obtained from high resolution CMB experiments. This cross-correlationis shown to have the power to break the degeneracy between the normalization ofthe matter power spectrum and the multiplicative bias of cosmic shear and to beable to constrain the latter to a few percent.

Using CMB lensing to constrain the multiplicative bias of cosmic shear