Bootstrap percolation on the random graph \(G_{n,p}\)

Bootstrap percolation on the random graph \(G_{n,p}\) is a process of spread of "activation" on a given realization of the graph with a given number of initially active nodes. At each step those vertices which have not been active but have at least \(r\geq2\) active neighbors become active...

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Veröffentlicht in:arXiv.org 2012-10
Hauptverfasser: Janson, Svante, Łuczak, Tomasz, Turova, Tatyana, Vallier, Thomas
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Sprache:eng
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Zusammenfassung:Bootstrap percolation on the random graph \(G_{n,p}\) is a process of spread of "activation" on a given realization of the graph with a given number of initially active nodes. At each step those vertices which have not been active but have at least \(r\geq2\) active neighbors become active as well. We study the size \(A^*\) of the final active set. The parameters of the model are, besides \(r\) (fixed) and \(n\) (tending to \(\infty\)), the size \(a=a(n)\) of the initially active set and the probability \(p=p(n)\) of the edges in the graph. We show that the model exhibits a sharp phase transition: depending on the parameters of the model, the final size of activation with a high probability is either \(n-o(n)\) or it is \(o(n)\). We provide a complete description of the phase diagram on the space of the parameters of the model. In particular, we find the phase transition and compute the asymptotics (in probability) for \(A^*\); we also prove a central limit theorem for \(A^*\) in some ranges. Furthermore, we provide the asymptotics for the number of steps until the process stops.
ISSN:2331-8422
DOI:10.48550/arxiv.1012.3535