Photons carry momenta, momentum is conserved in closed systems, so what would happen when a photon enters a black hole? Supposedly the momentum of the photon will be transferred to the new combined body of black hole and photon (i.e. a more massive black hole), but when is this transferring going to take place? At the photon's entry into the event horizon? Never? Or perhaps the acceleration process last until the end of the universe? Or is there some error in the whole premise?
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