Doubly nonlocal Fisher–KPP equation: front propagation. Issue 7 (19th May 2021)

• Record Type: Journal Article
• Authors: Finkelshtein, Dmitri; Kondratiev, Yuri; Tkachov, Pasha
• Is Part Of: Applicable analysis. Volume 100:Issue 7(2021)
• Page Start: 1373
• Page End: 1396
• Publication Date: 2021-05-19
• Subjects: Nonlocal diffusion -- Fisher–KPP equation -- nonlocal nonlinearity -- long-time behavior -- front propagation -- anisotropic kernels -- integral equation; 35K55 -- 35K57 -- 35B40; Mathematical analysis -- Periodicals; 515
• DOI: 10.1080/00036811.2019.1643011
• Languages: English
• ISSNs: 0003-6811

Abstract

ABSTRACT: We study propagation over R d of the solution to a doubly nonlocal reaction–diffusion equation of the Fisher–KPP-type with anisotropic kernels. We present both necessary and sufficient conditions which ensure linear in time propagation of the solution in a direction. For kernels with a finite exponential moment over R d we prove front propagation in all directions for a general class of initial conditions decaying in all directions faster than any exponential function (that includes, for the first time in the literature about the considered type of equations, compactly supported initial conditions).