Crossover from Isotropic to Directed Percolation

Details Crossover from Isotropic to Directed Percolation Crossover from Isotropic to Directed Percolation

2011-09-29

arxiv.org/abs/1109.6567v3

Physics

Condensed Matter

Statistical Mechanics

7 pages, 7 figures

Scientific paper

We generalize the directed percolation (DP) model by relaxing the strict directionality of DP such that propagation can occur in either direction but with anisotropic probabilities. We denote the probabilities as $p_{\downarrow}= p \cdot p_d$ and $p_{\uparrow}=p \cdot (1-p_d)$, with $p $ representing the average occupation probability and $p_d$ controlling the anisotropy. The Leath-Alexandrowicz method is used to grow a cluster from an active seed site. We call this model with two main growth directions {\em biased directed percolation} (BDP). Standard isotropic percolation (IP) and DP are the two limiting cases of the BDP model, corresponding to $p_d=1/2$ and $p_d=0,1$ respectively. In this paper, besides the cases of IP and DP, we also consider a new region $1/2

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