Off topic, but at some point could you explain how unitarity prevents information loss in a black hole. I get how a pure state should not emerge as a mixed state in Hawking radiation, but is there something else I'm missing?
A mixed state is not a pure state. I don't understand the question, sorry. A unitary time-evolution is reversible. You can't lose information if you can turn back time and reconstruct the initial state.
Off topic, but at some point could you explain how unitarity prevents information loss in a black hole. I get how a pure state should not emerge as a mixed state in Hawking radiation, but is there something else I'm missing?
ReplyDeleteA mixed state is not a pure state. I don't understand the question, sorry. A unitary time-evolution is reversible. You can't lose information if you can turn back time and reconstruct the initial state.
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