Article Contents

2013, Volume 8, Issue 1: 275-289. Doi: 10.3934/nhm.2013.8.275

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A short proof of the logarithmic Bramson correction in Fisher-KPP equations

1.
Université d'Aix-Marseille, LATP, 39 rue F. Joliot-Curie, 13453 Marseille Cedex 13
2.
Department of Mathematics, Duke University, Box 90320, Durham, NC, 27708-0320
3.
Institut de Mathématiques, Université Paul Sabatier, 118 route de Narbonne, F-31062 Toulouse Cedex 4
4.
Department of Mathematics, Stanford University, Stanford, CA 94305

Received: May 2012

Revised: November 2012

Published: March 2013

Abstract / Introduction Related Papers Cited by

Abstract

In this paper, we explain in simple PDE terms a famous result of Bramson about the logarithmic delay of the position of the solutions $u(t,x)$ of Fisher-KPP reaction-diffusion equations in $\mathbb{R}$, with respect to the position of the travelling front with minimal speed. Our proof is based on the comparison of $u$ to the solutions of linearized equations with Dirichlet boundary conditions at the position of the minimal front, with and without the logarithmic delay. Our analysis also yields the large-time convergence of the solutions $u$ along their level sets to the profile of the minimal travelling front.

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Mathematics Subject Classification: Primary: 35K57, 35C07; Secondary: 35B40.

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