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.
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2 comments:

  1. Bill7:03 PM, March 01, 2019

    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?

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    Replies
    1. Sabine Hossenfelder12:03 AM, March 02, 2019

      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.

      Delete

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