Quantum corrections to frame-dragging in scattering amplitudes

Frame-dragging effect manifests itself as polarization direction rotation when linearly polarized electromagnetic/gravitational wave scatters from a spinning point source through gravitational interactions. Treating general relativity as an effective field theory, the polarization rotation angle and its quantum corrections are computed using scattering amplitudes. While the classical angle is universal as expected from the equivalence principle, the quantum corrections are found to be different between electromagnetic and gravitational waves, supporting earlier studies that some formulations of the equivalence principle seem to be violated in the quantum regime.Comment: more accessible discussions, shortened abstract, updated references; 7 pages, 1 TikZ figure, 1 ancillary fil