clipka <nomail@nomail> wrote:
> nemesis <nam### [at] gmailcom> wrote:
> >   Does the singularity or blackholes even exist or are merely the point
> > where GR equations break?

> I honestly suspect exactly that... see Achilleus and the turtle: With the wrong
> approach, you get the result that the fastest runner can't catch up with the
> turtle... while reality proves he can.

  The major objections against singularities are more or less philosophical,
rather than based on hard science. It's "hard to believe" that mass could
be compressed into a point of zero volume.

  However, if reading about quantum mechanics and general relativity has
taught me something, it's that the Universe doesn't always work intuitively,
and there are lots of things which are "hard to believe", yet demonstrably
happen.

  If someone objects to the notion of a singularity, he would have to show
some evidence that GR doesn't work as predicted in this case. There must be
some property of the Universe which makes GR not work in this situation,
something which actually stops the singularity from forming. What could this
phenomenon be? Has anyone ever measured such phenomenon to exist?

  If not, then any objection against singularities is more or less
philosophical. "It doesn't sound right" is not hard science.

  The thing is, if GR equations are right, and there is a lot of evidence
suggesting that they are, then there simply is no way for a singularity
to not to form when a mass collapses to be smaller than its Schwarzschild
radius. All geodesics inside the event horizon, including time geodesics,
point towards the center. There's no known way for matter/energy to stop
going towards this center. Just advancing in time makes it advance towards
this center. Even if you tried to apply some force to a particle to stop
it from getting closer to the center, you couldn't, not even if you applied
an infinite force.

  The only possible conclusion is that all the matter and energy compresses
into a point of zero volume. If the singularity does not form in reality,
then something must explain why. Something more than philosophical objections.

-- 
                                                          - Warp

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