Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-05-18
Astronomy and Astrophysics
Astrophysics
Proceedings of "III Congresso Nazionale di Cosmologia" Grado (Ts), 26-28 october 1994. Figures are available under request at
Scientific paper
Galaxies and clusters distributions show two major properties: (i) the positions of galaxies and clusters are characterized by a power law distribution indicating properties with respect to their positions. (ii) The distribution of masses is also characterized by a power law corresponding to self similarity of different nature. These two properties are naturally unified by the concept of multifractality. This concept naturally arises if the distribution of matter, as given by both positions and masses, has self similar properties. We discuss the experimental situation in this respect and we introduce a simple stochastic model based of the aggregation process of particles The aim of this model is to understand which characteristic properties of the aggregation probability can gives rise to multifractal distribution In particular we find that a crucial element in this respect is that the aggregation probability should depend on the environment of the aggregation region.
Pietronero Luciano
Sylos Labini Francesco
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