Cosmology from quantum potential
  It was shown recently that replacing classical geodesics with quantal
(Bohmian) trajectories gives rise to a quantum corrected Raychaudhuri equation
(QRE). In this article we derive the second order Friedmann equations from the
QRE, and show that this also contains a couple of quantum correction terms, the
first of which can be interpreted as cosmological constant (and gives a correct
estimate of its observed value), while the second as a radiation term in the
early universe, which gets rid of the big-bang singularity and predicts an
infinite age of our universe.
