Non-cooperative Fisher–KPP systems: traveling waves and long-time behavior

Léo Girardin (1)

1 LJLL - Laboratoire Jacques-Louis Lions

This paper is concerned with non-cooperative parabolic reaction–diffusion systems which share structural similarities with the scalar Fisher–KPP equation. These similarities make it possible to prove, among other results, an extinction and persistence dichotomy and, when persistence occurs, the existence of a positive steady state, the existence of traveling waves with a half-line of possible speeds and a positive minimal speed and the equality between this minimal speed and the spreading speed for the Cauchy problem. Non-cooperative KPP systems can model various phenomena where the following three mechanisms occur: local diffusion in space, linear cooperation and su-perlinear competition.

Mots clés: structured population; KPP nonlinearities; reaction–diffusion system; steady states; traveling waves.

Domaines: Equations aux dérivées partielles [math.AP]

Léo Girardin. Non-cooperative Fisher–KPP systems: traveling waves and long-time behavior. Nonlinearity, 2017, 31, pp.108-164. ⟨hal-01418454v3⟩