Are Black Holes sufficiently characterized?

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  • #1
cph
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Is mass, angular momentum, and charge sufficient for black hole characterization? Or is also entropy, and hence surface area, also required? Thus is the shape for a given mass black hole also a required consideration?
 

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  • #2
phinds
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From all the reading I've done, I gather that the mass and spin are the properties that matter. I haven't read of charge being much of an issue in real BHs and size seems to be mentioned only as the diameter of the event horizon.
 
  • #3
Nabeshin
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This is precisely the statement of the no-hair theorem, that mass, angular momentum, and charge are the only three numbers necessary to describe a BH. The quantities you mention, entropy and surface area, are derived from the above three.
 
  • #4
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From all the reading I've done, I gather that the mass and spin are the properties that matter.
For real, astrophysical black-holes -- the charge can be assumed to be zero, as a black-hole will be formed from (ridiculously close to) equal numbers of protons and electrons. But all three parameters are actually needed for a complete description, as Nabeshin said---according to the http://en.wikipedia.org/wiki/No_hair_theorem" [Broken]
 
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