http://www.cnr.it/ontology/cnr/individuo/prodotto/ID204137

Inhomogeneities in the universe (Articolo in rivista)

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Anno

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Alternative label

Francesco Sylos Labini (2011)
Inhomogeneities in the universe
in Classical and quantum gravity (Print)
(literal)

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Centro Enrico Fermi, Piazza del Viminale 1, 00184 Rome, Italy Istituto dei Sistemi Complessi CNR, Via dei Taurini 19, 00185 Rome, Italy (literal)

Titolo

Abstract

Standard models of galaxy formation predict that matter distribution is statistically homogeneous and isotropic and characterized by (i) spatial homogeneity for r < 10 Mpc h(-1), (ii) small-amplitude structures of relatively limited size (i.e. r < 100) Mpc h(-1) and (iii) anti-correlations for r > r(c) approximate to 150 Mpc h(-1) (i.e. no structures of size larger than r(c)). Whether or not the observed galaxy distribution is interpreted to be compatible with these predictions depends on the a priori assumptions encoded in the statistical methods employed to characterize the data and on the a posteriori hypotheses made to interpret the results. We present strategies to test the most common assumptions and we find evidence that, in the available samples, galaxy distribution is spatially inhomogeneous for r < 100 Mpc h(-1) but statistically homogeneous and isotropic. We conclude that the observed inhomogeneities pose a fundamental challenge to the standard picture of cosmology but they also represent an important opportunity which may open new directions for many cosmological puzzles. (literal)

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