Unilateral sources and sinks of an activator in reaction–diffusion systems exhibiting diffusion-driven instability. (October 2019)

• Record Type: Journal Article
• Authors: Fencl, Martin; Kučera, Milan
• Is Part Of: Nonlinear analysis. Volume 187(2019)
• Page Start: 71
• Page End: 92
• Publication Date: 2019-10
• Subjects: 35K57 -- 35B32 -- 35J57 -- 35J50 -- 92C15; Reaction–diffusion systems -- Unilateral terms -- Turing's patterns -- Positively homogeneous operators -- Maximal eigenvalue; 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.2019.04.001
• Languages: English
• ISSNs: 0362-546X

Abstract

Abstract: A reaction–diffusion system exhibiting Turing's diffusion driven instability is considered. The equation for an activator is supplemented by unilateral terms of the type s − ( x ) u −, s + ( x ) u + describing sources and sinks active only if the concentration decreases below and increases above, respectively, the value of the basic spatially constant solution which is shifted to zero. We show that the domain of diffusion parameters in which spatially non-homogeneous stationary solutions can bifurcate from that constant solution is smaller than in the classical case without unilateral terms. It is a dual information to previous results stating that analogous terms in the equation for an inhibitor imply the existence of bifurcation points even in diffusion parameters for which bifurcation is excluded without unilateral sources. The case of mixed (Dirichlet–Neumann) boundary conditions as well as that of pure Neumann conditions is described.