According to General Relativity (GR), mass-energy curves spacetime, and light follows geodesics in that curved spacetime. Observations of gravitational lensing suggest that light, regardless of frequency, bends in the same way.
However, could there be any physical mechanism—either within GR or in potential quantum gravity theories—that would cause different frequencies of light to experience spacetime curvature differently? In other words, could a "gravitational prism" effect exist, where different wavelengths follow slightly different geodesics due to unknown gravitational interactions?
If such an effect were real, could it hint at quantum gravitational corrections or modifications to the classical geodesic equation? Are there any theoretical models or experimental results that explore this possibility?
