Decoupling inequalities and interlacement percolation on G x Z

Abstract

We study the percolative properties of random interlacements on the product of G with the integer line Z, when G is a weighted graph satisfying certain sub-Gaussian estimates attached to the parameters alpha > 1, measuring the volume growth on G, and beta between 2 and alpha + 1, measuring the sub-diffusive nature of the random walk on G. We develop decoupling inequalities, which are a key tool in showing that the critical level u_* for the percolation of the vacant set of random interlacements is always finite in our set-up, and that it is positive when alpha \geq 1 + beta/2. We also obtain several stretched exponential controls both in the percolative and non-percolative phases of the model. Even in the case where G = Z^d, d \geq 2, several of these results are new.

49 pages, 5 figures, accepted for publication in Inventiones mathematicae

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