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No hair theorem loophole

  1. May 13, 2009 #1
    Does anybody roughly now the basics of why you can have hairy black holes in more than 4 D?

    Thanks :)
  2. jcsd
  3. May 13, 2009 #2
    can you? I wasn't aware that you could.
  4. May 14, 2009 #3
    You can have hairy black holes, that's for sure. The question is that I don't know why. :(
  5. May 14, 2009 #4


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    How do you know that? Any references?
  6. May 14, 2009 #5
    If you don't no why then you can't be sure can you? If someone says you can have hairy black holes why take their word for it?

    I do recall that there are more black hole solutions in higher dimensions...ring solutions

    so i believe this paper contains the answers you are looking for http://arxiv.org/abs/hep-th/0608012
  7. May 14, 2009 #6


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    "no hair" in 4D means "nothing except"
    - mass
    - charge
    - angular momentum

    so what do you mean by "hair":
    - additional charges?
    - higher rep. for angular momentum?
    - ...
  8. May 14, 2009 #7
    You are right, if I don't know why I can't be sure. :)

    Thanks for the reference, I'll take a look at it.

    About the hair of the black hole. Well I was talking about scalar hair.

    I was reading some paper where they say they use a hairy black hole, with scalar hair, so I thought it ought to exist.

    After writing this question I found this paper where they give some evidence of possible hairy black holes with scalar hair. I haven't read it carefully yet but that's what it seems.


    I'm not familiar with the topic so I'm still a little confused about all together.

    Thanks for the replies :)
  9. May 14, 2009 #8


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    If it's a scalar, then why would you call it hair? :confused:
  10. May 14, 2009 #9
  11. May 14, 2009 #10
    In dimensions higher than four Einstein's Field Equations lead to singularities of dimension greater than zero e.g. black rings, and in general black p-branes. Obviously such a configuration must be described by its spatial distribution, in the sense of black hole hair.
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