Black Holes and Gravity

[circa 1991]

Question: How does gravity get out of a black hole?  If gravity is mediated 
by a particle, say graviton, and the particle is subject to the usual 
limitation that nothing can travel faster than light, how do gravitons get 
across the event horizon?  The part of the gravity of a black hole that is due 
to stress of space time outside the event horizon can certainly be mediated by 
gravitons without them needing to exceed the speed of light, but that just 
postpones the question:  Why is space time stressed outside the event horizon, 
if gravitons cannot escape from it?  Do they perhaps escape by Hawking-Penrose 
radiation?  That does not seem right, because the intensity of Hawking-Penrose 
radiation decreases with increasing mass of the black hole.
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Like I have said before, gravity and quantum mechanics have yet 
to be reconciled, and I think your question points out one possible place 
where reconciliation maybe difficult.  I am sure there are resolutions for 
this though - for example, if you are actually outside the event horizon, then 
there is no way for you to distinguish a real black hole from something that 
is just barely about to become a black hole but has not quite made it yet 
because the last bit of matter between you and the black hole-to be is a 
little too far from the center.  So, gravitons can, perhaps, escape just 
before the black hole forms, and that historical event of the black holes 
formation may provide enough information to keep up the gravitational field on 
the outside.  I do not actually does gravitation could answer?

A. Smith
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