Sunday, February 24, 2019

Away Note

I am in London for a few days and comments are likely to pile up in the queue more than usual. Pls play nicely while I'm away.


  1. 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?

    1. 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.


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