Deriving Stefan’s Law implicitly uses the 4/3 scaling law. This is apparent in an intermediate step of the derivation of Stefan’s Law, as for example in Planck’s text on heat or shown by Longair in his Theoretical Concepts in Physics. The 4/3 scaling law implies that a distance in 3 D space stretches by 4/3 relative to the same distance set in 4D space. The cosmic scale factor a(t) varies with time and seems to suppose a single reference frame that itself is being stretched. So: is the FLRW metric's a(t) scale factor consistent with Stefan's Law?
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