Applications of Mathematics, Vol. 64, No. 1, pp. 61-73, 2019


Dynamics and patterns of an activator-inhibitor model with cubic polynomial source

Yanqiu Li, Juncheng Jiang

Received May 9, 2018.   Published online January 17, 2019.

Abstract:  The dynamics of an activator-inhibitor model with general cubic polynomial source is investigated. Without diffusion, we consider the existence, stability and bifurcations of equilibria by both eigenvalue analysis and numerical methods. For the reaction-diffusion system, a Lyapunov functional is proposed to declare the global stability of constant steady states, moreover, the condition related to the activator source leading to Turing instability is obtained in the paper. In addition, taking the production rate of the activator as the bifurcation parameter, we show the decisive effect of each part in the source term on the patterns and the evolutionary process among stripes, spots and mazes. Finally, it is illustrated that weakly linear coupling in the activator-inhibitor model can cause synchronous and anti-phase patterns.
Keywords:  activator-inhibitor model; cubic polynomial source; Turing pattern; global stability; weakly linear coupling
Classification MSC:  35B32, 35B35, 35B40, 92C15
DOI:  10.21136/AM.2019.0142-18

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Affiliations:   Yanqiu Li, Juncheng Jiang, Nanjing University of Technology, 30 Puzhu Road, Nanjing, Jiangsu 211816, China, e-mail: liyanqiu_1111@163.com, littlelemon1111@163.com


 
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