Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2003-07-04
Physica A335 (2004) 616-628
Physics
Condensed Matter
Statistical Mechanics
13 pages, latex, 9 eps figures. Title and abstract changed, Introduction and Summary are revised, main body is unchanged, to b
Scientific paper
10.1016/j.physa.2003.12.006
In order to understand characteristics common to distributions which have both fractal and non-fractal scale regions in a unified framework, we introduce a concept of typical scale. We employ a model of 2d gravity modified by the $R^2$ term as a tool to understand such distributions through the typical scale. This model is obtained by adding an interaction term with a typical scale to a scale invariant system. A distribution derived in the model provides power law one in the large scale region, but Weibull-like one in the small scale region. As examples of distributions which have both fractal and non-fractal regions, we take those of personal income and citation number of scientific papers. We show that these distributions are fitted fairly well by the distribution curves derived analytically in the $R^2$ 2d gravity model. As a result, we consider that the typical scale is a useful concept to understand various distributions observed in the real world in a unified way. We also point out that the $R^2$ 2d gravity model provides us with an effective tool to read the typical scales of various distributions in a systematic way.
Anazawa Masahiro
Ishikawa Atushi
Suzuki Tadao
Tomoyose Masashi
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