[ispom]

It will take still some years, until the supernova /Acceleration sample (SNAP)
http://snap.lbl.gov/
brings us clarify of the question:

is „the dark energy “(70 per cent of our universe consists of) the by Einstein postulated „cosmological constant “or is it the second possibility considered by the cosmologists: a „quintessence “?

in the first case we would have an accelerated expansion never ending, our universe becomes more and more empty and bleak, until remaining only a lepton desert.

the accelerated expansion by the quintessence sketches however a less hopeless future picture, because after this conception the accelerated expansion continues only briefly.

now I ask myself (and the others): the ominously „energy of the vacuum “, http://en.wikipedia.org/wiki/Vacuum_energy
postulated by the quantum theory, is that a cosmological constant or is it a quintessence???