Originally posted by uzless
How do you know this? Are you basing this on gravitons not exceeding the speed of light? Have there been any experiments to test what happens to an object when a close is removed?
Well to my surprise here is a link supporting the propagation of gravity:
http://www.metaresearch.org/cosmology/speed_of_gravity.asp
Have you read this work? It seems to boil down to proving there is no aberration effect in gravity like what is seen in visual aberrations (the position of the moon during solar eclipses, etc.)
I must confess total ignorance of this effect. Do you have further details of this?
What I wonder is if gravity does indeed propagate at some 2 E10 times c, can this effect be used to create some kind of communications system going that much faster than c.
Or indeed, allows somehow travel faster than c. Or if there is no possible connection the the idea that gravity may respond faster than c.
I think this paper was written about 13 odd years ago, I wonder if there have been updates. I also notice a layman's article in Analog listed at the end.
Analog is a science fiction magazine that has layman science articles in every issue. It would appeal to science fiction fans that would question the GR and SR idea of c as being the speed limit of motion.
Even if gravity can respond billions of times faster than c does not inherently allow motion of matter faster than c.
I would like to see some work exploring the idea that if there were gravitational aberration effects it would automatically increase angular momentum in orbiting bodies as stated by that piece.
It is a lot to read for sure.
A bit of further reading in a Wiki piece:
Aberration in general relativity
The finite speed of gravitational interaction in general relativity may at first seem to lead to exactly the same sorts of problems with the aberration of gravity that Newton was originally concerned with. In general relativity, however, (similar to the field theories above), gravitomagnetism effects cancel out the effects of aberration.[clarification needed] As shown by Carlip, in the weak stationary field limit, the orbital results calculated by general relativity are the same as those of Newtonian gravity (with instantaneous action at a distance), despite the fact that the full theory gives a speed of gravity of c.[12] Although the calculations are considerably more complicated, one can show that general relativity does not suffer from aberration problems just as electromagnetic retarded Liénard–Wiechert potential theory does not. It is not very easy to construct a self-consistent gravity theory in which gravitational interaction propagates at a speed other than the speed of light, which complicates discussion of this possibility.[13]
So GR introduces the concept of gravitomagnetism to constrain the speed of gravity to that of c.
So it seems you would also have to disprove gravitomagnetism also to claim gravity goes faster than c.
Here is a link to the 2002 experimental measurements of the speed of gravity, at first thought to be disproved but later to be confirmed, it seems so far:
http://www.csa.com/discoveryguides/gravity/overview.php