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Re: Time Dilation

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Posted by Zephram Cochrane/">Zephram Cochrane on November 13, 1999 03:24:18 UTC

: : : : If time comes to a stop at the event horizon of a black hole, how can : : : : they ever coalesce?

: : : The "stop" that you refer to applies to a black hole with a static metric. In other words, it applies to one that has already formed and nothing falling in is significantly changing the metric. The dynamics of particles falling into the hole is different when you consider a variable metric.

: : yanniru: Time becomes the radial space dimension inside the horizon of a black hole. Don't ask me just what that implies.

: I don't exactly know what any of this mean's BUT... if time stops right before you go into a black hole... how do things ever fall into them?

:The "stop" happens to the falling object's "internal clock" in the remote coordinate observer's frame, but not in the falling object frame. It really isn't anything other than a coordinate transformation problem. A test mass falling into a black hole of static metric does take an infinite time to reach the event horizon in the remote observer's coordinate frame, but the time is finite for the falling object itself.

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