* Alexander Lorz (DAMTP, Cambridge University) - MAP5-UMR 8145

Alexander Lorz (DAMTP, Cambridge University)

Population dynamics and Dirac concentrations in a multidimensional nonlocal parabolic equation

vendredi 11 mars 2011, 9h45 - 10h45

Salle de réunion, espace Turing

Joint work with S. Mirrahimi and B. Perthame (both at LJLL, Paris VI)

Résumé/abstract :

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 concentration points and of the mass of the Dirac? We will explain how this relates to the so-called ‘constrained Hamilton-Jacobi equation’ and how numerical simulations can exhibit unexpected dynamics well explained by this equation. Our motivation comes from ‘populational adaptive evolution’ a branch of mathematical ecology which models Darwinian evolution.