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BHs Matter

  1. Jun 2, 2005 #1

    wolram

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    For a BH to form it must have a mass boundary, but does this boundary
    vary with differing types of matter?
     
  2. jcsd
  3. Jun 2, 2005 #2

    mathman

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    Black holes have only three properties: mass, charge, and angular momentum. What matter went into it doesn't matter.
     
  4. Jun 5, 2005 #3

    Labguy

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    Black holes have four properties:

    Mass
    Charge
    Angular momentum
    Magnetic field

    All blacks holes have to have a magnetic field.
     
  5. Jun 6, 2005 #4

    mathman

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    Is the magnetic field independent of the other three properties? (I don't think so, but I am not sure.)
     
  6. Jun 6, 2005 #5

    Labguy

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    It would be independent of any net charge (usually=0), but the mass and especially angular momentum would contribute significantly to the strength of the magenetic field. See an older post on this at:

    https://www.physicsforums.com/showthread.php?p=254126#post254126

    EDIT: For some reason, that link didn't work (on this computer) so here is the prior post:

     
    Last edited: Jun 6, 2005
  7. Jun 7, 2005 #6

    mathman

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    This is something I was not aware of. It looks like the magnetic field results from the interaction of the spinning black hole with the surrounding media. In that sense it is a derived thing, not basic as the three other items. The magnetic field doesn't seem to be an independent intrinsic property.
     
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