The Soneira-Peebles model (Soneira & Peebles 1978) is applied to study the clustering distribution. Started from level L = 0, eta is the number of points within each circle at each level, the radius at each level is R / lambda ^ L and total points are eta ^ L. The fractal dimension D = log(eta)/log(lambda). The corresponding slope in 2D two-point correlation function is D – 2.
R. M. Soneira and P. J. E. Peebles, The Astronomical Journal 83, 845 (1978).
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