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BIRS Workshop Lecture Videos

Interfaces in the Fisher equation and a Hamilton-Jacobi equation Yanagida, Eiji


We consider the dynamics of interfaces in the Fisher-KPP equation. It is known that solutions of this equation exhibit interfaces that correspond to transition layers from the trivial steady state to a positive steady state. If an initial value decays rapidly in space, then the interface moves with a constant speed that is equal to the minimal speed of traveling fronts in one-dimensional space. On the other hand, it is known that if an initial value decays slowly, the interface may move in a rather irregular way. In this talk, we show that the dynamics of interfaces for slowly decaying initial data can be described as a level set of a Hamilton-Jacobi equation. We also discuss properties of solutions of the Hamilton-Jacobi equation. This is a joint work with Hirokazu Ninomiya (Meiji University).

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