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Information loss via black Holes

  1. Jul 9, 2009 #1
    This question is about the relationship between information, entropy and heat.

    I think it was in the 1970's the Hawking claimed "information is lost in black hole evaporation". This did not mean it was just inaccessible, but that it has literally disappeared, gone forever.

    In the Black Hole War, Leonard Susskind 2008, pg 23 discusses when he first realized this must be wrong:

    So assuming there IS information sitting in a black hole why is heated generated
    when it evaporates? Is the existing heat with the black hole "released" beyond the event horizon and exposed so we can observe its effects...is that what Susskind is getting at?? And if so was all the "hidden stuff" necessarily so hot before it became a black hole..doesn't seem so.
    Last edited: Jul 9, 2009
  2. jcsd
  3. Jul 12, 2009 #2
    gravitational energy converted to heat energy?? hee

    perhaps the things that black hole sucked in are still inside and are breaking up to form heat energy??
  4. Oct 14, 2009 #3
    just found this old question of mine...no, there is no matter inside the event horizon..only gravitational energy...all matter is believed destroyed...compressed into sub Planck unknown form....

    and by the way, I don't think entropy and heat must inevitably accopmany each other but that relationship is not at all clear to me....
  5. Oct 14, 2009 #4
    Entropy is the the measure of disorder in a system. So water heating up to its boiling point is an example of a system whose entropy is increasing, correct? Particles are vibrating faster and faster causing the system's entropy to increase as water to approaches its boiling point.

    I can't think of anything in nature where where a system's heat increases but it's entropy does not (or vice versa).

    What exactly is not clear about that relationship to you / can you provide a situation where this is not relationship is not true?

    (This discussion should be moved to the General Physics Forum)?
  6. Oct 14, 2009 #5
    Where there is information there is entropy and where there is entropy there is heat.
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