Nonfixation for Activated Random Walks

Details Nonfixation for Activated Random Walks Nonfixation for Activated Random Walks

2009-10-17

arxiv.org/abs/0910.3338v4

Mathematics

Probability

13 pages; Removed Theorem of density=1 as it was valid only for d=1, which was already shown in arXiv:0908.1152v1

Scientific paper

We consider the activated random walk (ARW) model where particles follow the path of a general Markov process on a general graph. We prove ARW dominates a simpler process, multiple source internal aggregation (MSIA), and use this to formulate a deterministic sufficient condition on initial occupations for nonfixation of ARW and similar variants. In particular, on bounded degree graphs, initial occupation density greater than one almost surely implies nonfixation, where independence requirements are weakened to ergodic in the case of Euclidean lattices. We show that for Euclidean lattices of dimension lower than five, initial density of exactly one also implies nonfixation. Finally, we prove the critical density for the infinite sleep rate ARW is positive for all dimensions.

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