Statistics Papers

Document Type

Journal Article

Date of this Version

6-2001

Publication Source

Potential Analysis

Volume

14

Issue

4

Start Page

375

Last Page

385

DOI

10.1023/A:1011216004099

Abstract

It is well known for which gauge functions H there exists a flow in Z d with finite H energy. In this paper we discuss the robustness under random thinning of edges of the existence of such flows. Instead of Z d we let our (random) graph cal C(Z d,p) be the graph obtained from Z d by removing edges with probability 1−p independently on all edges. Grimmett, Kesten, and Zhang (1993) showed that for d ≥ 3, p > pc(Z d), simple random walk on C cal (Z d, p) is a.s. transient. Their result is equivalent to the existence of a nonzero flow f on the infinite cluster such that the x 2 energy ∑e f(e)2 is finite. Levin and Peres (1998) sharpened this result, and showed that if d ≥ 3 and p > pc(Zd), then cal C(Zd, p) supports a nonzero flow f such that the x q energy is finite for all q > d / (d−1). However, for general gauge functions, there is a gap between the existence of flows with finite energy which results from the work of Levin and Peres and the known results on flows for Zd. In this paper we close the gap by showing that if d ≥ 3 and Z d supports a flow of finite H energy then the infinite percolation cluster on Zd also support flows of finite H energy. This disproves a conjecture of Levin and Peres.

Copyright/Permission Statement

The final publication is available at Springer via http://dx.doi.org/10.1023/A:1011216004099.

Keywords

percolation, energy, electrical networks, nonlinear potential theory

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Date Posted: 27 November 2017

This document has been peer reviewed.