Conservation laws or not, you ought to believe in the existence of the photon because you continue having the evidence of its existence—it’s your memory of having fired the photon! Your memory is entangled with the state of the universe, not perfectly, but still, it’s Bayesian evidence. And if your memory got erased, then indeed, you’d better stop believing that the photon exists.
Conservation laws or not, you ought to believe in the existence of the photon because you continue having the evidence of its existence—it’s your memory of having fired the photon! Your memory is entangled with the state of the universe, not perfectly, but still, it’s Bayesian evidence. And if your memory got erased, then indeed, you’d better stop believing that the photon exists.