Sharp interface limit of the Fisher-KPP equation
Langue
en
Article de revue
Ce document a été publié dans
Communications on Pure and Applied Analysis. 2012, vol. 11, n° 1, p. 1-18
AIMS American Institute of Mathematical Sciences
Résumé en anglais
We investigate the singular limit, as $\ep \to 0$, of the Fisher equation $\partial _t u=\ep \Delta u + \ep ^{-1}u(1-u)$ in the whole space. We consider initial data with compact support plus, possibly, perturbations very ...Lire la suite >
We investigate the singular limit, as $\ep \to 0$, of the Fisher equation $\partial _t u=\ep \Delta u + \ep ^{-1}u(1-u)$ in the whole space. We consider initial data with compact support plus, possibly, perturbations very small as $\Vert x \Vert \to \infty$. By proving both generation and motion of interface properties, we show that the sharp interface limit moves by a constant speed, which is the minimal speed of some related one-dimensional travelling waves. We obtain an estimate of the thickness of the transition layers. We also exhibit initial data \lq\lq not so small" at infinity which do not allow the interface phenomena.< Réduire
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