Expansion in $n^{-1}$ for percolation critical values on the $n$-cube and $Z^n$: the first three terms

Details Expansion in $n^{-1}$ for percolation critical values on the $n$-cube and $Z^n$: the first three terms Expansion in $n^{-1}$ for percolation critical values on the $n$-cube and $Z^n$: the first three terms

2004-01-08

arxiv.org/abs/math/0401072v1

Mathematics

Probability

18 pages, 3 figures

Scientific paper

Let $p_c(\mathbb{Q}_n)$ and $p_c(\mathbb{Z}^n)$ denote the critical values for nearest-neighbour bond percolation on the $n$-cube $\mathbb{Q}_n = \{0,1\}^n$ and on $\Z^n$, respectively. Let $\Omega = n$ for $\mathbb{G} = \mathbb{Q}_n$ and $\Omega = 2n$ for $\mathbb{G} = \mathbb{Z}^n$ denote the degree of $\mathbb{G}$. We use the lace expansion to prove that for both $\mathbb{G} = \mathbb{Q}_n$ and $\mathbb{G} = \mathbb{Z}^n$, $p_c(\mathbb{G}) & = \cn^{-1} + \cn^{-2} + {7/2} \cn^{-3} + O(\cn^{-4}).$ This extends by two terms the result $p_c(\mathbb{Q}_n) = \cn^{-1} + O(\cn^{-2})$ of Borgs, Chayes, van der Hofstad, Slade and Spencer, and provides a simplified proof of a previous result of Hara and Slade for $\mathbb{Z}^n$.

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