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Consider a double slit experiment at the event horizon of a black hole, with 1 slit on each side of the horizon, one observer inside and 1 outside, inside observer should observe interference by equivalence principle, whereas outside one should not, since the photons can't enter the second slit and exit the BH. But if the slit records interference or not, ie it draws a bunch of points on the screen where photons hit, then if afterwards both observers enter the BH and look at the screen, then there will be a paradox if they disagree? How is it resolved?
See also http://physics.stackexchange.com/q/2750/394
See also http://physics.stackexchange.com/q/2750/394