Re: Planck length and black holes

On Mar 7, 2:53 am, "mike3" <mike4...@xxxxxxxxx> wrote:
Hi.

I've heard that it is impossible to "confine" a particle to a distance
smaller than one Planck length, since that would cause it to become a
black hole. But wait! A black hole singularity is a place of INFINITE
density, which means it's infinitely SMALLER than a Planck length! So
once you get it into a black hole, it is indeed "confined" to a much
smaller region! Or is it possible that perhaps black holes are _not_
infinitely dense, and this is just a place where current theory fails,
and that they might in reality have only finite (but presumably, huge)
density?

Yes, it is possible. We have no idea what happens inside a black hole
event horizon.

All we know are the following two things:
1. We know of no physical processes that will stop the gravitational
collapse inside the event horizon.
2. We know nothing about what happens at scales comparable to, or
smaller than, the Planck scale.

Any presumed contradictions about what happens *at* the singularity
are purely artifacts of extrapolation beyond what we really know.

PD

.

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