18 Jul
2015
18 Jul
'15
9:55 p.m.
On 7/18/2015 4:23 PM, Eugene Salamin via math-fun wrote:
Beware of applying the lensing principle to the static gravitational field. I'm not saying there is lensing, and I'm not saying there's not; just be careful. The basis of this caution is the fact from electromagnetic theory that the electric field of a charge moving at constant velocity is directed towards (or away from) the instantaneous position of the charge. It does not point to where the charge was at an earlier time as if the field propagated at the speed of light.
-- Gene
It's the same for GR. If you try to make Newtonian gravity "relativistic" by having the force point toward the retarded position of the source it doesn't work at all. Brent