Am 22.07.2010 21:46, schrieb Darren New:

>> Hence if all the mass is in a singularity, it cannot be in the
>> form of particles, but something else completely (basically something
>> that cannot be described with current knowledge of physics).
>
> That's fair. But I would more say "we don't know if they're still
> particles or something else" than I would say "we know they can't be
> particles because the math says there's zero space at the bottom of the
> well."

An interesting thought in this context is that the mass will never 
actually reach the singularity state anyway as long as the universe 
exists, due to the extreme warping of space-time.

>> People don't claim to know what happens in the singularity. They claim
>> that
>> the equations say something about what happens *outside* the singularity
>> (and that "something" is, basically, "there can't be anything inside the
>> event horizon and outside the singularity, hence the only possible place
>> where everything must be is in the singularity, because that's where all
>> the space-time geodesics are pointing to").

I think there's a flaw in here, too: The event horizon itself is subject 
to relativity as well. An observer approaching the black hole in free 
fall will witness the event horizon to "dent in" in front of him, even 
when he himself has already passed the event horizon as witnessed from a 
far-away observer.

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