Technion - Israel Institute of Technology Department of Mathematics ===================================== PDE AND APPLIED MATHEMATICS SEMINAR ===================================== DATE: Tuesday, November 22, 2011 SPEAKER: Lenya Ryzhik, Stanford TITLE: KPP spreading rate in a periodic environment PLACE: Room 814, Amado Mathematics Building, Technion TIME: 14:30 ABSTRACT: It is well known since the celebrated paper by Bramson that solutions of the KPP type reaction-diffusion equations with compactly supported initial data lag by distance $(3/2)\log t$ behind the corresponding traveling front. An interesting open problem is whether similar results on the discrepancy between the solutions of the nonlinear and linearized problems hold in heterogeneous media. As a first small step in this direction we consider this problem in a periodic environment and show that the delay is still logarithmic in time. This is a joint work with F. Hamel, J. Nolen and J.-M. Roquejoffre. For further info: Yehuda Pinchover <pincho@techunix.technion.ac.il> For past and future Applied Math/PDE seminars see: <http://www.math.technion.ac.il/pde/seminar.html> --------------------------------------------------------- Technion Math. Net (TECHMATH) Editor: Michael Cwikel <techm@math.technion.ac.il> Announcement from: Yehuda Pinchover <pincho@tx.technion.ac.il>