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Did the path between emission and reception change the photon? Or did it change our relation to the photon? A simpler case of the latter is uncontroversial: If

Did the path between emission and reception change the photon? Or did it change our relation to the photon? A simpler case of the latter is uncontroversial: If you move quickly away from a photon emitter, you will detect red-shifted photons. Clearly, the photons didn't change, only our relation to them. Energy, like everything else, is relative and appears to have different quantities in different situations. Strange as that seems, given conservation of energy still holds. But energy, just like space-time, is not "Euclidean".

zmgsabst 2y ago
> Did the path between emission and reception change the photon? Or did it change our relation to the photon? That’s irrelevant navel gazing: the operator which describes the change depends on the continuous path between. > Strange as that seems, given conservation of energy still holds. I don’t believe it does when factoring in expansion — or at least, that hasn’t been shown. https://www.youtube.com/watch?v=ZYM6HMLgIKA https://www.youtube.com/watch?v=ZYM6HMLgIKA