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Compact cluster growth on the half-plane: forest fires in a valley

Michael J Kearney

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A two-parameter model on a directed lattice is introduced to represent the growth and spread of clusters on the half-plane. The model exhibits a phase transition in the compact directed percolation universality class between a state where clusters are finite with probability one and a state where clusters are infinite with non-zero probability. In the finite regime, exact expressions are given for the mean perimeter length and area of the generated clusters for a variety of different boundary conditions. An illustrative example is considered, namely a forest fire spreading before a prevailing wind along the floor and sides of an idealized valley.


PACS

05.50.+q Lattice theory and statistics (Ising, Potts, etc.)

02.50.Cw Probability theory

64.60.Cn Order–disorder transformations

MSC

60Axx Foundations of probability theory

82B43 Percolation (See also 60K35)

60K35 Interacting random processes; statistical mechanics type models; percolation theory (See also 82B43, 82C43)

82B26 Phase transitions (general)

Subjects

Computational physics

Condensed matter: structural, mechanical & thermal

Statistical physics and nonlinear systems

Dates

Issue 11 (21 March 2003)

Received 24 January 2003

Published 6 March 2003



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