Uniformity of universe expansion

[nomadreid]

As far as I understand, the justifications for the uniformity of the expansion of the visible universe comes from the CMBR and from the uniformity of the red shift around us. However, I was wondering whether theoretically one could make an interferometer sensitive enough to measure this: the sensitivity of the Michelson Morley interferometer was enough to measure differences of the speed of light with respect to the vacuum, but it would need greater sensitivity to see whether, assuming this result, the expansion of space would make a difference in different directions. Is this an unrealizable thought experiment, or is the thought experiment itself faulty?

 

[phinds]

Well, clearly, assuming such a non-uniformity exists, it would require more sensitivity than our current instruments have to measure it since otherwise it would have already been observed. How much more sensitivity would, presumably, depend on the extent of the difference.

 

[nomadreid]

Thanks, phinds. In other words, the thought experiment is valid, but as many thought experiments, it is unknown whether it would eventually give a result.

 

[phinds]

Thanks, phinds. In other words, the thought experiment is valid, but as many thought experiments, it is unknown whether it would eventually give a result.

True, but it is very unlikely to give any results (other than just continuing support for the Cosmological Principle).