Complexity in cosmic structures

Francesco Sylos Labini and Andrea Gabrielli

Physica A: Statistical Mechanics and its Applications, 2004, vol. 338, issue 1, 44-49

Abstract: 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.

Keywords: Density structures; Spatial correlations; Homogeneity; Superhomogeneity; Fractal; Galaxy distribution; Standard cosmological models (search for similar items in EconPapers)
Date: 2004
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:338:y:2004:i:1:p:44-49

DOI: 10.1016/j.physa.2004.02.022

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