Fractal structures and the large scale distribution of galaxies

Details Fractal structures and the large scale distribution of galaxies Fractal structures and the large scale distribution of galaxies

2000-02-05

arxiv.org/abs/astro-ph/0002124v1

Astronomy and Astrophysics

Astrophysics

27 pages, 3 figures. To appear in the proceedings of the 7th Course in astrofundamental physics, Nato Advanced Study Institute

Scientific paper

Galaxy structures are certainly fractal up to a certain crossover scale \lambda_0. A clear determination of such a scale is still missing. Usually, the conceptual and practical implications of this property are neglected and the structures are only discussed in terms of their global amplitude. Here we present a compact summary of these implications. First, we discuss the problem of the identification of the crossover scale \lambda_0 and the proper characterization of the scaling. We then consider the implications of these properties with respect to various physical phenomena and to the corresponding characteristic values, i.e. r_0, \sigma_8, \Omega, etc. These implications crucially depend on the value of \lambda_0, but they are still important for a relatively small value, say \lambda_0 \approx 50 \hmp. Finally we consider the main theoretical consequences of these results.

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