Transition fronts of Fisher–KPP equations in locally spatially inhomogeneous patchy environments. (April 2022)

• Record Type: Journal Article
• Authors: Van Vleck, Erik S.; Zhang, Aijun
• Is Part Of: Nonlinear analysis. Volume 217(2022)
• Publication Date: 2022-04
• Subjects: 39A12 -- 34K31 -- 35K57 -- 37L60; Monostable -- Fisher–KPP equations -- Transition fronts -- Discrete heat kernel -- Discrete parabolic Harnack inequality -- Jacobi operators -- Lattice differential equation; Mathematical analysis -- Periodicals; Functional analysis -- Periodicals; Nonlinear theories -- Periodicals; Analyse mathématique -- Périodiques; Analyse fonctionnelle -- Périodiques; Théories non linéaires -- Périodiques; Functional analysis; Mathematical analysis; Nonlinear theories; Periodicals; Electronic journals; 515.7248
• DOI: 10.1016/j.na.2021.112748
• Languages: English
• ISSNs: 0362-546X

Abstract

Abstract: This paper is devoted to the study of spatial propagation dynamics of species in locally spatially inhomogeneous patchy environments or media. For a lattice differential equation with monostable nonlinearity in a discrete homogeneous media, it is well-known that there exists a minimal wave speed such that a traveling front exists if and only if the wave speed is not slower than this minimal wave speed. We shall show that strongly localized spatial inhomogeneous patchy environments may prevent the existence of transition fronts (generalized traveling fronts). Transition fronts may exist in weakly localized spatial inhomogeneous patchy environments but only in a finite range of speeds, which implies that it is plausible to obtain a maximal wave speed of existence of transition fronts.