A new signature of primordial non-Gaussianities from the abundance of
  galaxy clusters
  The evolution with time of the abundance of galaxy clusters is very sensitive
to the statistical properties of the primordial density perturbations. It can
thus be used to probe small deviations from Gaussianity in the initial
conditions. The characterization of such deviations would help distinguish
between different inflationary scenarios, and provide us with information on
physical processes which took place in the early Universe. We have found that
when the information contained in the galaxy cluster counts is used to
reconstruct the dark energy equation of state as a function of redshift,
assuming erroneously that no primordial non-Gaussianities exist, an apparent
evolution with time in the effective dark energy equation of state
arises,characterized by the appearance of a clear discontinuity.
