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In the old days before dark energy we used to say that a flatThey relate according to:
universe, i.e. critical density, would expand at a decreasing
rate with the rate of expansion tending to zero.
Now we know about dark energy. The rate of expansion is
accelerating. But CMBR observations tell us that the universe
is pretty much flat. How do flatness, critical density and fate
of the universe relate to each other in a universe with dark
energy?
Mark.