Empires and Percolation: Stochastic Merging of Adjacent Regions

Details Empires and Percolation: Stochastic Merging of Adjacent Regions Empires and Percolation: Stochastic Merging of Adjacent Regions

2009-11-03

arxiv.org/abs/0911.0601v1

Mathematics

Probability

13 pages

Scientific paper

We introduce a stochastic model in which adjacent planar regions $A, B$ merge stochastically at some rate $\lambda(A,B)$, and observe analogies with the well-studied topics of mean-field coagulation and of bond percolation. Do infinite regions appear in finite time? We give a simple condition on $\lambda$ for this {\em hegemony} property to hold, and another simple condition for it to not hold, but there is a large gap between these conditions, which includes the case $\lambda(A,B) \equiv 1$. For this case, a non-rigorous analytic argument and simulations suggest hegemony.

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