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Re: Event Horizon And Escape Velocity

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Posted by Zephram Cochrane/">Zephram Cochrane on February 24, 2000 21:24:36 UTC

: That sounds reasonable...thanks for the answer. : I have another question: How will the scenario be from the probes point of view. It passes through the event horizon and gets out through the event horizon (although the rest of the universe might have disappered during the, from the external point of view, infinite time)?

The equation from geodesic motion for the motion of the probe in the vicinity of a Swartzchild black hole as related to an energy parameter is

(1/2)(dr/dt)2 + r2(1 - 2GM/rc2)(dj/dt)2 - GM/r = T/m

One can use this to consider motion falling out of the hole. The problem is that without knowing the over all wormhole topology of the hole and the space it is not known whether its even falling out into the same universe from which it fell in. The most commonly accepted guess at the wormhole topology of a Schwartzchild hole is called Flamm's paraboloid. The region in which it falls in is called the black hole and the region where it falls out is called a white hole. The connection between the two regions is called a wormhole. The problem with transversing a wormhole and getting out of the hole is that in order for the wormhole to be a stable connection between the spaces there needs to be exotic matter(matter with negative energy) at that location. Fortunately it turns out that the region around the event horizon of a black hole should contain exotic matter. This is due to an aspect of the quantum mechanics involved in Hawking radiation. So to make a long story short, its possible for a probe to escape a hole through a wormhole, but without knowing the overall topology we are only guessing were it comes out.


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