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Physics
Special and General Relativity
FTL Gravity Waves: Is Faster-Than-Light Travel Possible?
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[QUOTE="pervect, post: 5599541, member: 14402"] Spatial expansion just doesn't propagate. You may think it "should" propagate, , but it turns out it doesn't. Another thing that doesn't propagate is the direction of the gravitational pull (or, for that matter, the direction of an electrostatic pull). The apparent position of the sun as observed visually (by light waves) changes due to the Earth's velocity, a phenomenon known as "aberration". Star positions change due to aberration too, a phenomenon known as "stellar aberration" that has to be routinely taken into account in astronomy. However, the actual direction of Newtonian gravity is well known NOT to aberrate in such a fashion. Note that this matches the behavior of the electrostatic force, which also do not aberrate. The main point I'm trying to make is that the presence or absence of aberration can serve as an experimental distinction between things which we consider to propagate, and things which we do not consider to propagate. The second point I'm making is that using this experimental distinction, we can say that waves propagate (because they do aberrate), while other gravitational effects (such as the direction of the Newtonian gravitational pull) do NOT propagate because they do not aberrate. I don't have any references for the non-aberration of spatial expansion, but there are some references on the non-aberration (and hence non-propagation) of the direction of gravitational pull. See for instance Steve Carlip's paper, "aberration and the speed of gravity", [URL]https://arxiv.org/abs/gr-qc/9909087[/URL]. [/QUOTE]
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Special and General Relativity
FTL Gravity Waves: Is Faster-Than-Light Travel Possible?
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