Abstract
Let G be a graph, and C = {0,1,...,κ-1} a set of colors. We want to discuss a continuous time random process ζt with state space CG = configurations of colors from C on the graph G. This system ζt, known as the stepping stone model, has very simple dynamics: in any state ζ and at any site x, the color at that site waits a mean 1/2 exponential holding time and then paints a randomly chosen neighboring vertex with its color. We will also be treating a companion process ξt on {subsets of G} called coalescing random walks. As the name implies, ξt consists of rate 1/2 continuous time random walks on G which coalesce when they collide. Let us write ξ At to denote the evolution of those walks which start on a subset A ⊂ G. The graphs of principal interest to us are:
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GN = the complete graph on {0,1,...,N-1},
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Z dN = the d-dimensional integers with period N,
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Zd = the d-dimensional integers.
Tropical interpretations of the dimension d are good therapy for a Minnesota February: Baja California (d=1), Society Islands (d=2), Caribbean Marine World (d=3), and of course Mathematical Physics (d > 4). The cardinality κ of the color set C might be 2 or 32,768 or even ∞.
Partially supported by N.S.F. Grant MDS-841317
Partially supported by N.S.F. Grant MDS-830549
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Cox, J.T., Griffeath, D. (1987). Recent Results for the Stepping Stone Model. In: Kesten, H. (eds) Percolation Theory and Ergodic Theory of Infinite Particle Systems. The IMA Volumes in Mathematics and Its Applications, vol 8. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-8734-3_6
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