Nonlinear Nonlocal Diffusion Equations for the Analysis of Coordination
John S. McAlister, Nina H. Fefferman, Tadele A. Mengesha
Coordination games with explicit spatial or relational structure are of interest to economists, ecologists, sociologists, and others studying emergent global properties in collective behavior. When assemblies of individuals seek to coordinate action with one another through myopic best response or other replicator dynamics, the resulting dynamical system can exhibit many rich behaviors. Here we seek to understand these coordination dynamics in the non-atomic setting by use of a nonlinear, nonlocal diffusion equation framework. For this class of nonlocal equations, we prove existence and uniqueness for the initial value problem in the free boundary case and, with certain conditions on the underlying game theory, we go further and prove a maximum principle, weak regularity results, and a characterization of asymptotic behavior. Additionally, with the help of several numerical results, we present several modeling results, characterizing stationary solutions both rigorously and through numerical experiments.
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