Electronic Journal of Probability

Bootstrap percolation on products of cycles and complete graphs

Janko Gravner and David Sivakoff

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Abstract

Bootstrap percolation on a graph iteratively enlarges a set of occupied sites by adjoining points with at least $\theta $ occupied neighbors. The initially occupied set is random, given by a uniform product measure, and we say that spanning occurs if every point eventually becomes occupied. The main question concerns the critical probability, that is, the minimal initial density that makes spanning likely. The graphs we consider are products of cycles of $m$ points and complete graphs of $n$ points. The major part of the paper focuses on the case when two factors are complete graphs and one factor is a cycle. We identify the asymptotic behavior of the critical probability and show that, when $\theta $ is odd, there are two qualitatively distinct phases: the transition from low to high probability of spanning as the initial density increases is sharp or gradual, depending on the size of $m$.

Article information

Source
Electron. J. Probab., Volume 22 (2017), paper no. 29, 20 pp.

Dates
Received: 23 May 2016
Accepted: 1 March 2017
First available in Project Euclid: 24 March 2017

Permanent link to this document
https://projecteuclid.org/euclid.ejp/1490320845

Digital Object Identifier
doi:10.1214/17-EJP43

Mathematical Reviews number (MathSciNet)
MR3629873

Zentralblatt MATH identifier
1361.60092

Subjects
Primary: 60K35: Interacting random processes; statistical mechanics type models; percolation theory [See also 82B43, 82C43]

Keywords
bootstrap percolation critical probability gradual transition sharp transition

Rights
Creative Commons Attribution 4.0 International License.

Citation

Gravner, Janko; Sivakoff, David. Bootstrap percolation on products of cycles and complete graphs. Electron. J. Probab. 22 (2017), paper no. 29, 20 pp. doi:10.1214/17-EJP43. https://projecteuclid.org/euclid.ejp/1490320845


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