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Stationary multiple spots for reaction–diffusion systems

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Abstract

In this paper, we review analytical methods for a rigorous study of the existence and stability of stationary, multiple spots for reaction–diffusion systems. We will consider two classes of reaction–diffusion systems: activator–inhibitor systems (such as the Gierer–Meinhardt system) and activator–substrate systems (such as the Gray–Scott system or the Schnakenberg model). The main ideas are presented in the context of the Schnakenberg model, and these results are new to the literature. We will consider the systems in a two-dimensional, bounded and smooth domain for small diffusion constant of the activator. Existence of multi-spots is proved using tools from nonlinear functional analysis such as Liapunov–Schmidt reduction and fixed-point theorems. The amplitudes and positions of spots follow from this analysis. Stability is shown in two parts, for eigenvalues of order one and eigenvalues converging to zero, respectively. Eigenvalues of order one are studied by deriving their leading-order asymptotic behavior and reducing the eigenvalue problem to a nonlocal eigenvalue problem (NLEP). A study of the NLEP reveals a condition for the maximal number of stable spots. Eigenvalues converging to zero are investigated using a projection similar to Liapunov–Schmidt reduction and conditions on the positions for stable spots are derived. The Green’s function of the Laplacian plays a central role in the analysis. The results are interpreted in the biological, chemical and ecological contexts. They are confirmed by numerical simulations.

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  1. Department of Mathematics, The Chinese University of Hong Kong, Shatin, Hong Kong

    Juncheng Wei

  2. Department of Mathematical Sciences, Brunel University, Uxbridge, UB8 3PH, UK

    Matthias Winter

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  1. Juncheng Wei
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Wei, J., Winter, M. Stationary multiple spots for reaction–diffusion systems. J. Math. Biol. 57, 53–89 (2008). https://doi.org/10.1007/s00285-007-0146-y

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