Re: More on the controversy about the Schwarzschild radius and black
- From: stevendaryl3016@xxxxxxxxx (Daryl McCullough)
- Date: 17 May 2007 03:26:26 -0700
Eric Gisse says...
stevendaryl3...@xxxxxxxxx (Daryl McCullough) wrote:
In article <x6I2i.233$4Y...@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Tom Roberts says...
Daryl McCullough wrote:
So the boundary between "too late to escape"
and "not too late to escape" is a sphere that is expanding
outward at the speed of light. Tom is calling that boundary
the "event horizon".
This is not just me "calling it that" -- that's what the phrase "event
horizon" _means_.
I didn't mean to suggest otherwise, but I think that LEJ Brouwer may be
thinking of the "event horizon" and the "Schwarzschild radius" as synonymous.
Aren't they, in _this specific case_ ?
Definitely not. In the case we are talking about, we have a
converging shell of matter. Inside the shell, there is no
matter to speak of. So the total mass involved in the
scenario is constant, M = the mass of the shell. The
corresponding Schwarzschild radius is also constant,
R = 2GM/c^2. But the event horizon is expanding outwards
at speed c. So they're not the same thing. The event
horizon is not expanding because the Schwarzshchild
radius is expanding. The relationship between them is
just this: the radius of the event horizon approaches
the Schwarzschild radius as t --> infinity.
--
Daryl McCullough
Ithaca, NY
.
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