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The Physical Meaning...

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Posted by Bruce on March 6, 2002 22:52:53 UTC

of the r-coordinate for the Schwarzchild geometry

r = circumference of shell / 2p

for the Kerr geometry

R^2 = r^2 + a^2 + 2Ma^2/r

r horizon = M (+ or -) (M^2 - a^2)^1/2

a = J/M [J is angular momentum and M is mass expressed as a length (meters)]

for the extreme Kerr geometry

R^2 = r^2 + M^2 + 2M^3/r [since a maximum = M]

The physical meaning of the t-coordinate is where the time interval is being measured.

These are simplified for the equatorial plane.


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