Is there any experimental, practical reason or aspect of the theory/model that requires that the speed of expansion of the universe be ≥ C? The Hubble constant, the only experimental datum, comes from a formula Ve/T0*Ve that allows any possibility. If we considered Ve = C/2 , R would be 7.2 Gly, would that be a problem, since distances are measured according to a model and are not absolute? That would make inflation, if it really occurred, more plausible , as an increase of speed over a short period wouldn't change sensibly the size of the universe. That would also allow for an increase in the rate of expansion, now, without violating the founding law of the universe Thanks for your attention.