Journal
COMMUNICATIONS IN PARTIAL DIFFERENTIAL EQUATIONS
Volume 36, Issue 6, Pages 1071-1098Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03605302.2010.538784
Keywords
Adaptive evolution; Dirac concentrations; Hamilton-Jacobi equation; Lotka-Volterra parabolic equation
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Funding
- King Abdullah University of Science and Technology (KAUST) [KUK-I1-007-43]
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Nonlocal Lotka-Volterra models have the property that solutions concentrate as Dirac masses in the limit of small diffusion. Is it possible to describe the dynamics of the limiting concentration points and of the weights of the Dirac masses? What is the long time asymptotics of these Dirac masses? Can several Dirac masses co-exist? We will explain how these questions relate to the so-called oconstrained Hamilton-Jacobi equationo and how a form of canonical equation can be established. This equation has been established assuming smoothness. Here we build a framework where smooth solutions exist and thus the full theory can be developed rigorously. We also show that our form of canonical equation comes with a kind of Lyapunov functional. Numerical simulations show that the trajectories can exhibit unexpected dynamics well explained by this equation. Our motivation comes from population adaptive evolution a branch of mathematical ecology which models Darwinian evolution.
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