  We show that Dark Matter consisting of bosons of mass of about 1eV or less
has critical temperature exceeding the temperature of the universe at all
times, and hence would have formed a Bose-Einstein condensate at very early
epochs. We also show that the wavefunction of this condensate, via the quantum
potential it produces, gives rise to a cosmological constant which may account
for the correct dark energy content of our universe. We argue that massive
gravitons or axions are viable candidates for these constituents. In the far
future this condensate is all that remains of our universe.
