Quote:
Originally Posted by Nesti
Yes.
"by allowing the components of the metric tensor to vary with time"...ummm, who's time are we talking about here Steven? A moving frame of reference would not agree with the same account because the very same light source which was used to measure as a comparison is constant in both frames...in ALL frames...or was the field in motion because the origin is actually moving, and the mover is in fact stationary? Light has no reference frame, ergo it lies to us by offering only a constancy. There is no cosmic ether wind, therefore no fixed background structure with which to measure against.
It's fine to talk about gravity when it's this or that, but the moment you want to get specific, ie make a comparison between the speed at which the metric changes versus the speed at which light propagates, you cannot. A fast moving passer-by would see a slow changing metric, true?
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It doen't matter if each observer measures a different rate of change of the metric components, the resultant gravitational wave still travels at c. The difference measured by each observer is the frequency of the wave.
This is how light behaves as well. All observers will measure the speed of light as c, but the frequency of light due to Doppler shift will vary according to the motion of the source relative to each observer.
Regards
Steven