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Journal Articles Journal of Differential Equations Year : 2010

Fast propagation for KPP equations with slowly decaying initial conditions

François Hamel
Lionel Roques

Abstract

This paper is devoted to the analysis of the large-time behavior of solutions of one-dimensional Fisher–KPP reaction–diffusion equations. The initial conditions are assumed to be globally front-like and to decay at infinity towards the unstable steady state more slowly than any exponentially decaying function. We prove that all level sets of the solutions move infinitely fast as time goes to infinity. The locations of the level sets are expressed in terms of the decay of the initial condition. Furthermore, the spatial profiles of the solutions become asymptotically uniformly flat at large time. This paper contains the first systematic study of the large-time behavior of solutions of KPP equations with slowly decaying initial conditions. Our results are in sharp contrast with the well-studied case of exponentially bounded initial conditions.
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Dates and versions

hal-02665534 , version 1 (31-05-2020)

Identifiers

  • HAL Id : hal-02665534 , version 1
  • PRODINRA : 39736

Cite

François Hamel, Lionel Roques. Fast propagation for KPP equations with slowly decaying initial conditions. Journal of Differential Equations, 2010, 249 (7), pp.1726-1745. ⟨hal-02665534⟩
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