If the accelerated expansion of the universe is due to dark energy, wouldn't this cause temperature fluctuations in the CMBR - as seen by COBE & WMAP ? Is it reasonable to assume that the dark energy is evenly distributed in the universe ? I think not ... ... but if it's not, the expansion should also be non-uniform, right ? In fact, the WMAP images might not be imprints from the early universe at all, it might be dark energy ? I'm sure there are other more significant consequences of non-uniform expansion than this though ... so it can be ruled out ... but what are they ?