Mike Raiford <"m[raiford]!at"@gmail.com> wrote:
> > Oh. You mean something *outside* the mass itself causes it to become a
> > black hole?
> >
> > But then, wouldn't that just mean that as soon as you remove the force,
> > it wouldn't be a black hole any more?
> >

> Which is why a small black hole would be short lived.

  A black hole cannot stop being a black hole (according to GR) because
nothing can come out. Once it has become a black hole, it will be like
that forever. (Quantum mechanics might cause something else to happen,
but from a purely GR point of view.)

> But, then, it does 
> have an event horizon, and nothing can escape a black hole. So, wouldn't 
> it remain a black hole after being compacted?

  There's no other possibility (in GR). A black hole can only grow (if
more matter is fed to it), not shrink.

-- 
                                                          - Warp

Post a reply to this message