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String theory on black holes.

  1. Apr 7, 2004 #1
    Ok, so we know that black holes emit Hawking radiation. Knowing this, it is safe to say that over time, black holes will decrease in size until they disappear totally. After decreasing, everything should go back to normal, you'd think. My question is, does the "data", that had been sucked in by the black hole after crossing the event horizon and hurdled toward the singularity, just dissapear? Is the information lost in a flop transition? Or does this "data" reappear?

    Maybe a more laymen question is: Is there such a thing as conservation of data, according to a black hole? I'd surely think there would be.

    Does String theory predict anything about this?


    Paden Roder
  2. jcsd
  3. Apr 7, 2004 #2
    The question I have is if the black hole shrinks too far, then can it lose enough mass to no longer remain a black hole and explode?
  4. Apr 7, 2004 #3
    Black holes are just the severe worping of spacetime fabric that is caused by too much mass being concentrated in such a little area. Think of the mass being a bowling ball, and spacetime being a trampoline. If the bowling ball gradually is turned into a liquid and then a steam and dissipates into the air, the warping of the trampoline will become less severe. Over time, the trampoline will come back to normal. There need be no explosion.

    Paden Roder
  5. Apr 8, 2004 #4
    When a black hole "evaporates" there isnt an explosion. I dont know what string theory predicts about loss of info through a black hole but something that i came across was that you can think there are virtual particle pairs near the event horizon of a black hole and so normally these virtual paricles occur briefly and then annhilate each other but near the evnt horizon of a black hole one of the virtual particles would go in whereas one of them would stay out. So we might lose some information however we would have a copy of it. Now this may be completely off track , im waiting for someone to correct me.
  6. Apr 8, 2004 #5
    But as the bowling ball gradually disappears, at some point the warping of the trampoline will be severe but not severe enough to make the ball qualify as a black hole. So what happens then? (I think that's what Mike2 was trying to get at; if not I'm sorry.)
  7. Apr 8, 2004 #6
    I actually don't know, that's a good question.
    Paden Roder
  8. Apr 8, 2004 #7
    Black hole information loss--string version

    I just recently posted a question about this on s.p.r. Hopefully, some of the real experts will reply. however, for one stringy explanation of why information is not lost in black holes, look up recent papers by Mathur, Lunen and coworkers in ArXiv. there are some short semitechnical papers as well as long technical ones. Both types of papers include some good pictures to help you visualize what is going on. But I gather this is not universally accepted. Jim Graber
  9. Apr 11, 2004 #8
    Thanks for the help.
    Paden Roder
  10. Apr 11, 2004 #9


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    The short answer is no one knows. There is compelling Stringy results that indicate, at least in their formalism, that the information loss is an illusion.

    But depending on who you ask, you will get different answers.
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