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Just finished reading Sean Carroll's "The Higgs Boson and Beyond". I would be grateful if someone could explain how gravity, which I understand to be a function of mass, can interact with massless particles as evidenced by the phenomenon of gravitational lensing. I understand that gravity is a local curvature of spacetime and photons move through spacetime so that makes sense. Is the explanation as simple as that?
Thanks and regards.
Thanks and regards.