DMTCS Proceedings, Discrete Random Walks, DRW'03

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DMTCS Conference vol AC (2003), pp. 39-44


Discrete Random Walks, DRW'03

Cyril Banderier and Christian Krattenthaler (eds.)

DMTCS Conference Volume AC (2003), pp. 39-44

author: Dayue Chen and Yuval Peres
title: The Speed of Simple Random Walk and Anchored Expansion on Percolation Clusters: an Overview
keywords: Cayley graphs, percolation, random walks, speed, anchored expansion constant.
abstract: Benjamini, Lyons and Schramm (1999) considered properties of an infinite graph
, and the simple random walk on it, that are preserved by random perturbations. To address problems raised by those authors, we study simple random walk on the infinite percolation cluster in Cayley graphs of certain amenable groups known as ``lamplighter groups''. We prove that zero speed for random walk on a lamplighter group implies zero speed for random walk on an infinite cluster, for any supercritical percolation parameter
. For
large enough, we also establish the converse. We prove that if
has a positive anchored expansion constant then so does every infinite cluster of independent percolation with parameter
sufficiently close to 1;We also show that positivity of the anchored expansion constant is preserved under a random stretch if, and only if, the stretching law has an exponential tail.
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reference: Dayue Chen and Yuval Peres (2003), The Speed of Simple Random Walk and Anchored Expansion on Percolation Clusters: an Overview , in Discrete Random Walks, DRW'03, Cyril Banderier and Christian Krattenthaler (eds.), Discrete Mathematics and Theoretical Computer Science Proceedings AC, pp. 39-44
bibtex: For a corresponding BibTeX entry, please consider our BibTeX-file.
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