Improved Lower Bounds for the Critical Probability of Oriented-Bond Percolation in Two Dimensions

Details Improved Lower Bounds for the Critical Probability of Oriented-Bond Percolation in Two Dimensions Improved Lower Bounds for the Critical Probability of Oriented-Bond Percolation in Two Dimensions

2004-12-17

arxiv.org/abs/math/0412348v1

Mathematics

Probability

16 pages, 5 figures

Scientific paper

We present a coupled decreasing sequence of random walks on $ \mathbb Z $ that dominates the edge process of oriented-bond percolation in two dimensions. Using the concept of "random walk in a strip ", we construct an algorithm that generates an increasing sequence of lower bounds that converges to the critical probability of oriented-bond percolation. Numerical calculations of the first ten lower bounds thereby generated lead to an improved,i.e. higher, rigorous lower bound to this critical probability, viz. $p_{c} \geq 0.63328 $. Finally a computer simulation technique is presented; the use thereof establishes 0.64450 as a non-rigorous five-digit-precision (lower) estimate for $p_{c}$.

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