Photons are considered massless so how do they interact with gravity? According to Einstein Relativity, only curvature of space is responsible for bending of light rays. If so, and mass to mass interaction is useless, is considering gravitation a force pointless?
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3$\begingroup$ Possible duplicates: physics.stackexchange.com/q/130552/2451 , physics.stackexchange.com/q/34352/2451 and links therein. $\endgroup$– Qmechanic ♦Commented May 30, 2020 at 3:40
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1$\begingroup$ see my relevant answer here physics.stackexchange.com/q/525011 $\endgroup$– anna vCommented May 30, 2020 at 3:41
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1$\begingroup$ @Qmechanic I think the duplicates talk about light (classical) not photons (quantum mechanical). the OP is talking of "mass to mass interaction" The answer needs the concept of quantization of gravity and gravitons.which is not in the duplicates. $\endgroup$– anna vCommented May 30, 2020 at 3:49
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$\begingroup$ @annav I think the linked questions are about photons. "How can gravity affect light?" explicitly mentions photons and them being massless, the other one mentions light being massless which is also only applicable if one thinks of light as photons. However, I agree that the answers are largely classical and ideally, IMO, they should mention photon-graviton vertices as you do in your linked answer. Maybe a version of your answer is needed on "How can gravity affect light?". :) $\endgroup$– user87745Commented May 30, 2020 at 6:06
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