Circular polarization of the CMB is generated by the helicity-dependent transverse shift of photon trajectories under the optical Magnus effect during gravitational lensing.
Maxwell equations in a curved spacetime: Spin optics approximation,
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Circular polarization of the cosmic microwave background induced by the optical Magnus effect on gravitational lensing
Circular polarization of the CMB is generated by the helicity-dependent transverse shift of photon trajectories under the optical Magnus effect during gravitational lensing.