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Black hole microstates and string theory

  1. Mar 25, 2009 #1
    Can someone give me a Pop science explanation of what do strings and Branes have got to do with black hole entropy.
    The no of degrees of freedom or the no of microstates of the black hole corresponding to a given macrostate is given by exp(S),where S is entropy of black hole which is related to area of event horizon.
    So how do you count microstates of black hole using these extended objects?
  2. jcsd
  3. Apr 18, 2009 #2


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    As far as I know the black holes in string theory are not "astrophysical" black holes with event horizons and so on. Instead they are so-called BPS states with interaction turned off. I would call them unphysical!
    The idea is that nevertheless these BPS states they correspond in some sense to black holes (if you could turn interaction on). It is possible to "count" these BPS states and to relate the entropy to the number of BPS states.
  4. Apr 18, 2009 #3
    You can get some insights at Wikipedia:


  5. Apr 18, 2009 #4
    And at the same location in Wikipedia:

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