2000/02/05 by Luciano Pietronero, Pietronero, Luciano, Francesco Sylos Labini +1 · 1 citation
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0002124
27 pages, 3 figures. To appear in the proceedings of the 7th Course in astrofundamental physics, Nato Advanced Study Institute, International Euroconference Erice, 5-16 December 1999
arxiv created 2000/02/05 · arxiv updated 2009/12/01
Galaxy structures are certainly fractal up to a certain crossover scale λ0. 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 λ0 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. r0, σ8, Ω, etc. These implications crucially depend on the value of λ0, but they are still important for a relatively small value, say λ0 ≈ 50 \hmp. Finally we consider the main theoretical consequences of these results.