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Thread: Evaporating Black Holes and Violation of Unitary

  1. #1 Evaporating Black Holes and Violation of Unitary 
    Senior Member
    Join Date
    Jan 2014
    Here's an easy read.

    Black Hole Information Loss
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  2. #2  
    Senior Member
    Join Date
    Mar 2013
    I like that link for its clarity. But now I'm left wondering why the "problem" is a problem? If the Hawking Radiation has randomness, then it still has information doesn't it?

    The article says:

    For instance, in our example we took a state described by a set of eigenvalues and coefficients, a large set of numbers, and transformed it into a state described by temperature, one number. All the other structure of the state was lost in the transformation.

    Because the black hole is only described by one number. But after it radiates Hawking Radiation to return to its previous mass, the Hawking Radiation would have information wouldn't it?

    I am confused. I'll keep reading and re reading and hope to clear it up for myself. But in the meantime if anyone has an explanation and feels like posting it, it would be much appreciated.
    A mathematician and an engineer were at a party. An older colleague of theirs was there with his daughter. The two each asked if they could speak to her. He said it was ok, but they had to approach her by going half way across the room, then stop, then half way again and stop and proceed in that manner. The mathematician realized that he would never reach her and gave up. The engineer determined that he could get close enough to talk. --Approximate retelling of a joke by my math teacher.
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