Re: Time dilation, spaghetti and black holes

In article <5rabq1pprmqlbk4gqh9tpf282i3jf2nsnh@xxxxxxx>,
jamesd@xxxxxxxxxxx says...
> Gerry Quinn

> > Many would agree with you, but not those devoted to
> > general relativity. Their claim is that the
> > singularity you have identified is a false
> > 'coordinate' singularity. And indeed the equations of
> > general relativity can be used to describe spacetimes
> > in which object trajectories can cross the horizon.

> The horizon to which Rick Locke refers is the outer
> event horizon, a mere coordinate singularity, in some
> coordinates but not others - which someone falling into
> a black hole will cross in finite subjective time. The
> question then is what happens to the person inside the
> black hole.

There is another question: can general relativity be trusted to
identify all physical singularities as such?

Certainly if you apply general relativity and nothing else, the event
horizon can be considered a coordinate singularity. General relativity
has no objection to time and space dimensions switching roles, for
example.

But that does not constitute proof that time and space really *can*
switch roles. General relativity does not say the event horizon is a
physical singularity; but that does not constitute proof that the event
horizon is not a physical singularity. Other physics may have
something to say also.

- Gerry Quinn





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