jrm@wdl1.UUCP (08/23/85)
< Sacrifice to Line Gobbler God > Having failed to receive a satisfactory answer to this from the gurus in net.physics and net.astro.expert, I am now posing the question to net.bizarre: > By definition, the gravitational feild of a black hole is so > intense that not even light or other wavicles with velocity c can escape. > My understanding is that gravity propagates with velocity c. (I believe > this has been proven. Correct?) Does this not imply that, at least as > far as the outside universe is concerned, the black hole has no > gravitational feild? > Further, since everything with velocity <=c is kept within > the black hole, does this not mean that the black hole is undetectable? > Even to the extent that you could pass through one or it could pass > through you and neither would know anything had happened? > Does quantum mechanics affect this? (In terms of "things" > escaping from the black hole.)
epm0@bunny.UUCP (Erik Mintz) (08/27/85)
> > By definition, the gravitational feild of a black hole is so > > intense that not even light or other wavicles with velocity c can escape. My recollection is that the definition is about electromagnetic radiation. I don't recall anything being mentioned about the other forces (gravitational, weak, or strong). > > My understanding is that gravity propagates with velocity c. (I believe > > this has been proven. Correct?) The basic statement (from relativity) is that no information can propogate faster than the speed of light. If Gravity propogated faster than C, you could create a gravitational telegraph, and violate this principle. > > Does quantum mechanics affect this? (In terms of "things" > > escaping from the black hole.) What you want is probably more related to general relativity than to quantum mechanics. I am not an expert in this area. I post these speculations only due to the lack of other responses. Other opinions are more than welcome. -- Erik Mintz ARPA or CSnet : epm0%gte-labs.csnet@csnet-relay UUCP: ...harvard!bunny!epm0