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Physics
Special and General Relativity
Does expanding space affect time dilation etc?
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[QUOTE="PeterDonis, post: 6168243, member: 197831"] This question isn't really answerable, because the concept of "time dilation" is not well-defined if "space" is expanding. ("Expanding space" isn't really the best description of what's going on, but going into that would probably be too much for this thread.) Same answer as above. You can make the questions well defined by considering, instead of "time dilation", something like the observed redshift/blueshift of light signals exchanged between the two objects. Then the answer would be that in the first case, each object would observe the other's light to be redshifted, and in the second case, each object would observe no redshift/blueshift in the other's light. [/QUOTE]
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Forums
Physics
Special and General Relativity
Does expanding space affect time dilation etc?
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