Small Deviations from Gaussianity and The Galaxy Cluster Abundance Evolution

Details Small Deviations from Gaussianity and The Galaxy Cluster Abundance Evolution Small Deviations from Gaussianity and The Galaxy Cluster Abundance Evolution

2000-03-14

arxiv.org/abs/astro-ph/0003193v1

Astronomy and Astrophysics

Astrophysics

10 pages with 2 figures, accepted for publication in ApJ

Scientific paper

10.1086/309232

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.

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