A number of papers over the past five years have sought to provide a better theoretical understanding of gravitational lensing by treating the lens as embedded in a spacetime geometry. Several relativistic results have been well established for non-rotating black holes and limits have been set on the feasibility of observation.
There have been relatively few papers that treat rotating lenses from a spacetime perspective to derive similar results to those known for Schwarzschild geometry. For example, one might want to know how caustic structure and observable quantities (image separation, magnification, shearing, etc.) change with increased lens angular momentum. It would be particularly interesting to determine whether there are (possibly future) observable consequences of the rotation.
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