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C.R. Burns, C.C. Dyer (Univ. of Toronto)
Polarization has been shown to be invariant under gravitational lensing and therefore can be used to constrain lensing models. In particular, if the polarization is correlated with the intrinsic morphology of the source (for example, the synchrotron emission from radio jets), then one can detect weak gravitational lensing by measuring deviations from this correlation. This technique has the advantage of sampling continuously the lensing potential and can therefore constrain the shape of the mass distribution. In the case of multiple imaging, the polarization can add constraints to the lensing model, since it is mapped as a vector quantity as opposed to the intensity, which maps as a scalar. This paper will describe the technique and results of using polarization to constrain gravitational lens models.
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