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Re: Bruce, Can Light Escape A Black Hole?

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Posted by Bruce on December 30, 2000 22:51:55 UTC

A pulse of light (any signal) is gravitationally redshiffted out of existence at r = 2M (event horizon) for a Schwarzchild black hole.
"for an r-coordinate less than the Schwarzchild radius 2M, the curvature factor (1-2M/r) in the Schwarzchild metric becomes negative. The t-coordinate changes from a timelike coordinate to a spacelike coordinate and the r-coordinate changes to a timelike coordinate. What does this mean? It means that our free-float frame moves to ever decreasing r with all the inevitability that we associate with the passage of time." All paths lead to r = 0. There has been alot of research evaluating differnt types of black holes which I can't speak for. Here is an interesting conclusion for a possible escape from a Schwarzchild hole.
This would require that you get this done very quickly because the maximum horizon to crunch time
(horizon to singularity) is
pM = tmax[meters]
all terms expressed in units of meters.
For a black hole of ~ 5 solar mass M = 7385 m.
(3.1416)(7385m)=23200 2/3 m
23200 2/3 m / c = .000077336 seconds

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