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Reduced Circumference

  1. Jun 14, 2005 #1
    Okay, I understand that the r-coordinate in the Schwarzschild metric represents the reduce circumference. My problem is that the r-coordinate in the Kerr metric is NOT the reduced circumference! What is it? Somebody, please answer this as quickly and as painlessly as possible!
    Thank You
  2. jcsd
  3. Jun 21, 2005 #2


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    Science Advisor

    Right, it is not. What is it? Sorry, I don’t know... I guess that if you make a coordinate change in a way that you get [tex]\inline{R(r)^2 d{\phi}^2}[/tex] then [tex]\inline{R}[/tex] will be the reduced circumference for [tex]\inline{\phi}}[/tex]. May be this can give you a hint about a possible physical meaning of [tex]\inline{r}[/tex].
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