Triangular constellations in fractal measures

Wilkinson, Michael and Grant, John (2014). Triangular constellations in fractal measures. EPL, 107(5), article no. 50006.



The local structure of a fractal set is described by its dimension D, which is the exponent of a power-law relating the mass N in a ball to its radius ε:N~εD. It is desirable to characterise the shapes of constellations of points sampling a fractal measure, as well as their masses. The simplest example is the distribution of shapes of triangles formed by triplets of points, which we investigate for fractals generated by chaotic dynamical systems. The most significant parameter describing the triangle shape is the ratio z of its area to the radius of gyration squared. We show that the probability density of z has a phase transition: P(z) is independent of ε and approximately uniform below a critical flow compressibility βc, which we estimate. For β >βc the distribution appears to be described by two power laws: P(z)~ zα1 when 1» z» zc(ε), and P(z)~ zα2 when z« zc(ε).

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