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Site recurrence for coalescing random walk

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arxiv 1510.04721 v1 pith:G2HT5IKR submitted 2015-10-15 math.PR

classification math.PR
keywords sitecoalescingparticlesprocessproverandomtreesbacktrack
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Begin continuous time random walks from every vertex of a graph and have particles coalesce when they collide. We use a duality relation with the voter model to prove the process is site recurrent on bounded degree graphs, and for Galton-Watson trees whose offspring distribution has exponential tail. We prove bounds on the occupation probability of a site, as well as a general 0-1 law. Similar conclusions hold for a coalescing process on trees where particles do not backtrack.

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