Does light's polarization change how much a black hole bends it?

Beyond standard ray optics, a photon's polarization (helicity) interacts with spacetime curvature and nudges light off its expected geodesic path. Calculating this spin-optics deflection for two classes of black holes — a general parametrized metric and a 'hairy' regular black hole — the authors find each leaves a distinct signature in the deflection angle. The result raises the prospect of using precision light-bending measurements to distinguish exotic black hole solutions from ordinary ones.