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• W2099762906 abstract "Let G be a closed group of automorphisms of a graph X. We relate geometric properties of G and X, such as amenability and unimodularity, to properties of G-invariant percolation processes on X, such as the number of infinite components, the expected degree, and the topology of the components. Our fundamental tool is a new masstransport technique that has been occasionally used elsewhere and is developed further here.¶ Perhaps surprisingly, these investigations of group-invariant percolation produce results that are new in the Bernoulli setting. Most notably, we prove that critical Bernoulli percolation on any nonamenable Cayley graph has no infinite clusters. More generally, the same is true for any nonamenable graph with a unimodular transitive automorphism group.¶ We show that G is amenable if for all $ alpha < 1 $ , there is a G-invariant site percolation process $ omega $ on X with $ {bf P} [x in omega] > alpha $ for all vertices x and with no infinite components. When G is not amenable, a threshold $ alpha < 1 $ appears. An inequality for the threshold in terms of the isoperimetric constant is obtained, extending an inequality of Häggström for regular trees.¶ If G acts transitively on X, we show that G is unimodular if the expected degree is at least 2 in any G-invariant bond percolation on X with all components infinite.¶ The investigation of dependent percolation also yields some results on automorphism groups of graphs that do not involve percolation." @default.
• W2099762906 created "2016-06-24" @default.
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• W2099762906 date "1999-03-01" @default.
• W2099762906 modified "2023-10-18" @default.
• W2099762906 title "Group-invariant Percolation on Graphs" @default.
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• W2099762906 doi "https://doi.org/10.1007/s000390050080" @default.
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