Existence of standing pulse solutions to a skew-gradient system

[摘要] Reaction-diffusion systems have been primary tools for studying pattern formation. A skew-gradient system is well known to encompass a class of activator-inhibitor type reaction-diffusion systems that exhibit localized patterns such as fronts and pulses. While there is a substantial literature for the case of a linear inhibitor equation, the study of nonlinear inhibitor effect is still limited. To fill this research gap, we investigate standing pulse solutions to a skew-gradient system in which both activator and inhibitor reaction terms inherit nonlinear structures. Using a variational approach that involves several nonlocal terms, we establish the existence of standing pulse solutions with a sign change. In addition, we explore some qualitative properties of the standing pulse solutions. (c) 2021 Elsevier Inc. All rights reserved.

[发布日期] 2021-11-25

[关键词] FitzHugh-Nagumo;Local minimizer;Standing pulse;Skew-gradient