Abstract
We argue that the following three statements cannot all be true: (i) Hawking
radiation is in a pure state, (ii) the information carried by the radiation is
emitted from the region near the horizon, with low energy effective field
theory valid beyond some microscopic distance from the horizon, and (iii) the
infalling observer encounters nothing unusual at the horizon. Perhaps the most
conservative resolution is that the infalling observer burns up at the horizon.
Alternatives would seem to require novel dynamics that nevertheless cause
notable violations of semiclassical physics at macroscopic distances from the
horizon.
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