- #1
timmdeeg
Gold Member
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Superluminal recession velocities of far away galaxies are due to the choice of FRW-coordinates. As @Ibix said here #71 "The key point, in this context, is that you will never see these galaxies overtake a light pulse."
But is there any other choice? Riemann normal coordinates don't seem to be the right answer because - if I understand it correctly - they describe the neighborhood of the origin and are thus not applicable globally.
Is the choice of FRW-coordinates compelling because curved spacetime can not be transformed away?
But is there any other choice? Riemann normal coordinates don't seem to be the right answer because - if I understand it correctly - they describe the neighborhood of the origin and are thus not applicable globally.
Is the choice of FRW-coordinates compelling because curved spacetime can not be transformed away?