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Re: Kerr's Equationsquestion
Forum List  Follow Ups  Post Message  Back to Thread Topics  In Response To Posted by Zephram Cochrane/">Zephram Cochrane on October 28, 1999 06:02:29 UTC 
: Could Someone please tell me what the following variables : in Kerr's equation for the angular velocity of a black hole : stand for?: : 'a','r','theta'. : Thankyou. a is sometimes called the rotation parameter or specific angular momentum. The first is more common, but I prefer the latter. It is related to the angular momentum of the black hole J and the mass of the hole M by a = J/Mc. Some representations of the black hole's geometry make use of spherical coordinates. r is the radial coordinate from the hole. You may choose to think of it as a coordinate for distance from the center of the hole. q, what your calling theta, is a coordinate for describing polar angle position. f, or Phi, is coordinate for the azymuthal angle. t is the coordinate for time. These coordinates for reasons of convenience are coordinates used by an observer who is remote from the hole. 

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