Re: Black hole questions
- From: "Eric Gisse" <jowr.pi@xxxxxxxxx>
- Date: 23 Nov 2006 14:25:35 -0800
sal wrote:
On Thu, 23 Nov 2006 10:02:10 -0700, N:dlzc D:aol T:com (dlzc) wrote:
Dear sal:
"sal" <pragmatist@xxxxxxxxxx> wrote in message
news:pan.2006.11.23.03.01.59.538035@xxxxxxxxxxxxx
On Wed, 22 Nov 2006 17:12:19 -0700, N:dlzc D:aol T:com (dlzc) wrote:...
Dear sal:
"sal" <pragmatist@xxxxxxxxxx> wrote in message
news:pan.2006.11.22.20.50.15.364154@xxxxxxxxxxxxx
No it does not. It takes infinite (Schwarzschild) time for anything,
including light, to reach the event horizon.
Nonsense.
http://hermes.physics.adelaide.edu.au/~dkoks/Faq/Relativity/BlackHoles/fall_in.html
... "finite proper time"
Not nonsense, and your reference doesn't contradict me. I said
"infinite (Schwarzschild) time". I didn't say "infinite proper time".
The proper time *is* evaluated in Schwarzchild coordinates.
The proper time can be evaluated in _any_ coordinates: It's the integral
of
sqrt(|ds^2|) = sqrt(|g_00 dt^2 + g_11 dr^2 [ + cross terms ]|)
....and your path intersects a coordinate singularity.
If you are going to use Schwarzschild coordinates, stop being surprised
when you get a nonsense answer if you try to anything at or beyond the
event horizon.
[...]
.
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