Small Deviations from Gaussianity and The Galaxy Cluster Abundance   Evolution
  We raise the hypothesis that the density fluctuations field which originates the growth of large scale structures is a combination of two or more distributions. By applying the statistical analysis of finite mixture distributions to a specific combination of Gaussian plus non-Gaussian random fields, we studied the case where just a small departure from Gaussianity is allowed. Our results suggest that even a very small level of non-Gaussianity may introduce significant changes in the cluster abundance evolution rate. 
A.L.B. Ribeiro (Unicamp), C.A. Wuensche (Inpe) and P.S. Letelier   (Unicamp)