Slow and fast minimal speed traveling waves of the FKPP equation with chemotaxis

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Abstract

We examine a general model for the Fisher-KPP (FKPP) equation with nonlocal advection. The main interpretation of this model is as describing a diffusing and logistically growing population that is also influenced by intraspecific attraction or repulsion. For a particular choice of parameters, this specializes to the Keller-Segel-Fisher equation for chemotaxis. Our interest is in the effect of chemotaxis on the speed of traveling waves. We prove that there is a threshold such that, when interactions are weaker and more localized than this, chemotaxis, despite being non-trivial, does not influence the speed of traveling waves; that is, the minimal speed traveling wave has speed 2 as in the FKPP case. On the other hand, when the interaction is repulsive, we show that the minimal traveling wave speed is arbitrarily large in a certain asymptotic regime in which the interaction strength and length scale tend to infinity.

Original languageEnglish (US)
Pages (from-to)175-203
Number of pages29
JournalJournal des Mathematiques Pures et Appliquees
Volume167
DOIs
StatePublished - Nov 2022
Externally publishedYes

Keywords

  • Chemotaxis
  • Fisher-KPP
  • Minimal speed
  • Pushed and pulled fronts
  • Traveling waves

ASJC Scopus subject areas

  • Mathematics(all)
  • Applied Mathematics

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