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Perhaps I am thinking about this incorrectly when a photon arrives at an event horizon, from an observers perspective time has essentially stopped for it and the photon has red shifted completely. Before redshifting, the photon would have blue-shifted due to gravity. I cannot think of how to calculate this and I am hoping someone could shed some light on this.

Also, what happens to the energy of the photon since it is redshifted completely?

Joe
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  • Have look at the the answers here https://physics.stackexchange.com/questions/101619/photons-straight-into-black-hole – anna v Oct 19 '18 at 18:37
  • Why do you say the photon blueshufts? For which observer? – safesphere Oct 19 '18 at 18:46
  • "Also, what happens to the energy of the photon since it is redshifted completely?" -The energy of the BH is $E=Mc^2$. Do you think it includes the energy of the infalling photon? – safesphere Oct 19 '18 at 19:26

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