Re: A partial black hole?

: James Burns <burns.87@[EMAIL PROTECTED]
>
: Consider a particle inside the event horizon, just as
: you describe. /If nothing in the situation changes,/
: no message will ever be able to be sent from this particle to
: the outside world.

None of the things that can change can ever result in any particle
escaping.
(There's Hawking radiation, but that's not quite the same thing.  There's
the fact that information must be able to escape for thermodynamic
purposes,
but again that's not the same thing.

: However, a second black hole swoops in at a large fraction of the
: speed of light close to the first's event horizon.  Certainly, the
: event horizons of the first and second black holes will be affected. 
: I would think that the EH's would be closer to their respective
: singularities than otherwise, because of the gravitational forces
: canceling each other to some degree, in between the two, at least. 

Well... then you'd be wrong, near as I understand what you're proposing.

: It may be that certain coordinates that were below the event horizon
: before and after the passing of the second black hole would be above
: the event horizon during its passing. 

Well, no, it mayn't.

: Is it possible that a particle that would have stayed below the event
: horizon without the second black hole's intervention would instead be
: able to communicate to the outside world -- that is, could it be
: brought back up above the event horizon? 

No.

: Under your definition, the particle was therefore never below the
: event horizon, but it seems to me that the particle would have
: experienced conditions identical to below-the-event-horizon
: conditions. 

Also no.  Since if the conditions were identical, then it wouldn't
have escaped.  The point is, the event horizon isn't there just due to
really really strong forces that pull on objects.  It's there because
spacetime itself is distorted so that "futureward" is *always* "closer
to the singularity".


Wayne Throop   throopw@[EMAIL PROTECTED]
   http://sheol.org/throopw