What concept describes the physical requirement that the laws governing cosmic evolution remain consistent over vast periods of time?
Answer
Homogeneity in time
Homogeneity in time is the concept intrinsically linked to isotropy when considering look-back observations. Since observing light from distant objects is equivalent to looking back in time, assuming the universe was isotropic then requires assuming that the physical laws governing its evolution have remained consistent across those vast temporal spans. If the laws changed drastically over time, even an isotropic universe today would not imply an isotropic past. The CMB provides the snapshot confirming this pattern held true when the universe was significantly younger, supporting the assumption of temporal consistency.
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