Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-12
Physica A338 (2004) 44-49
Astronomy and Astrophysics
Astrophysics
6 pages 5 postscript figures. To be published in the proceedings of the Conference "A non-linear worlds: the real world" Secon
Scientific paper
10.1016/j.physa.2004.02.022
We discuss correlation properties of a general mass density field introducing a classification of structures based on their complexity. Standard cosmological models for primordial mass fluctuations are characterized by a sort of large-scale stochastic order, that we call super-homogeneity to highlight the fact that mass fluctuations increase as a function of scale in the slowest possible way for any stochastic mass field. On the other hand the galaxy spatial distribution show complex structures with a high degree of inhomogeneity and fractal-like spatial correlations up to some relevant cosmological scale. The theoretical problem of cosmological structure formation should then explain the growth of strongly correlated and non-linear structures from the very uniform field of density fluctuations given as standard initial condition.
Gabrielli Andrea
Sylos Labini Francesco
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