期刊
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
卷 510, 期 -, 页码 765-786出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physa.2018.07.004
关键词
Phase transition; Segregation model; Crime modeling; Territorial formation; Agent-based model; Cross-diffusion
资金
- National Science Foundation [DMS-1319462]
We present an agent-based model to simulate gang territorial development motivated by graffiti marking on a two-dimensional discrete lattice. For simplicity, we assume that there are two rival gangs present, and they compete for territory. In this model, agents represent gang members and move according to a biased random walk, adding graffiti with some probability as they move and preferentially avoiding the other gang's graffiti. All agent interactions are indirect, with the interactions occurring through the graffiti field. We show numerically that as parameters vary, a phase transition occurs between a well mixed state and a well-segregated state. The numerical results show that system mass, decay rate and graffiti rate influence the critical parameter. From the discrete model, we derive a continuum system of convection-diffusion equations for territorial development. Using the continuum equations, we perform a linear stability analysis to determine the stability of the equilibrium solutions and we find that we can determine the precise location of the phase transition in parameter space as a function of the system mass and the graffiti creation and decay rates. (C) 2018 The Authors. Published by Elsevier B.V.
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