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Rotation of a black hole

  1. May 17, 2009 #1
    Is it possible to calculate the rotation speed of a black hole? Idid not find anything on this on google.

    thanks
     
  2. jcsd
  3. May 17, 2009 #2

    Chronos

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    A Kerr black hole has a theoretical rotation component due to conservation of angular momentum. It cannot be measured directly as we cannot observe anything occuring inside the event horizon. I doubt it's meaningful to talk about rotataion with respect to the event horizon. For discussion, see
    http://science.howstuffworks.com/black-hole.htm/printable
     
  4. May 17, 2009 #3
    I heard in class of a theorie that would use the light emmited from the black hole surroundings to calculate the rotation speed, anyone familiar with these theories?
    thanks
     
  5. May 18, 2009 #4
  6. May 18, 2009 #5

    Chronos

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    Good link, maria, but, I am unconvinced the authors have derived an effective way to derive the intrinsic spin of a black hole.
     
  7. May 18, 2009 #6
    thank you for this link.
     
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