Model for Anisotropic Directed Percolation

Details Model for Anisotropic Directed Percolation Model for Anisotropic Directed Percolation

1997-10-28

arxiv.org/abs/cond-mat/9710298v1

Physics

Condensed Matter

RevTeX, 9 pages, 3 figures. To appear in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.57.2467

We propose a simulation model to study the properties of directed percolation in two-dimensional (2D) anisotropic random media. The degree of anisotropy in the model is given by the ratio $\mu$ between the axes of a semi-ellipse enclosing the bonds that promote percolation in one direction. At percolation, this simple model shows that the average number of bonds per site in 2D is an invariant equal to 2.8 independently of $\mu$. This result suggests that Sinai's theorem proposed originally for isotropic percolation is also valid for anisotropic directed percolation problems. The new invariant also yields a constant fractal dimension $D_{f} \sim 1.71$ for all $\mu$, which is the same value found in isotropic directed percolation (i.e., $\mu = 1$).

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