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2014 A forest-fire model on the upper half-plane
Robert Graf
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Electron. J. Probab. 19: 1-27 (2014). DOI: 10.1214/EJP.v19-2625


We consider a discrete forest-fire model on the upper half-plane of the two-dimensional square lattice. Each site can have one of the following two states: "vacant" or "occupied by a tree". At the starting time all sites are vacant. Then the process is governed by the following random dynamics: Trees grow at rate 1, independently for all sites. If an occupied cluster reaches the boundary of the upper half plane or if it is about to become infinite, the cluster is instantaneously destroyed, i.e. all of its sites turn vacant. Additionally, we demand that the model is invariant under translations along the x-axis. We prove that such a model exists and arises naturally as a subseqential limit of forest-fire processes in finite boxes when the box size tends to infinity. Moreover, the model exhibits a phase transition in the following sense: There exists a critical time $t_c$ (which corresponds with the critical probability $p_c$ in ordinary site percolation by $1 - e^{-t_c} = p_c$) such that before $t_c$, only sites close to the boundary have been affected by destruction, whereas after $t_c$, sites on the entire half-plane have been affected by destruction.<br />


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Robert Graf. "A forest-fire model on the upper half-plane." Electron. J. Probab. 19 1 - 27, 2014.


Accepted: 13 January 2014; Published: 2014
First available in Project Euclid: 4 June 2016

zbMATH: 1291.82037
MathSciNet: MR3164761
Digital Object Identifier: 10.1214/EJP.v19-2625

Primary: 60K35
Secondary: 82B43 , 82C22

Keywords: forest-fire model , phase transition , Self-organized criticality , upper half-plane


Vol.19 • 2014
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