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https://www.physicsforums.com/threads/can-a-photon-be-accelerated.901484/

Knowing...

1) Strong gravitational fields create strong curves in spacetime

2) Light traveling through strong gravitational fields get curved along the spacetime

3) Centripetal acceleration occurs at a constant speed, and light travels at constant speed c

Can it be concluded that photons traveling through strong gravitational fields undergo centripetal acceleration?

Also, do photons have relativistic mass? If so, could it be said that photons also experience centripetal force using the relativistic mass? Or is relativistic mass too obscure to be used for centripetal force?