# American Institute of Mathematical Sciences

May 2019, 39(5): 2807-2875. doi: 10.3934/dcds.2019118

## Existence and stability of one-peak symmetric stationary solutions for the Schnakenberg model with heterogeneity

 Department of Mathematical Sciences, Tokyo Metropolitan University, 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0397, Japan

* Corresponding author: Yuta Ishii

Received  June 2018 Revised  September 2018 Published  January 2019

Fund Project: The second author is supported by JSPS KAKENHI Grant Number 16K05240

In this paper, we consider stationary solutions of the following one-dimensional Schnakenberg model with heterogeneity:
 $\begin{equation*} \begin{cases} u_t-\varepsilon ^2 u_{xx} = d\varepsilon -u+g(x)u^2 v , & x \in (-1,1) ,\; t>0, \\ \varepsilon v_t-Dv_{xx} = \frac{1}{2}-\frac{c}{\varepsilon}g(x)u^2 v , & x \in (-1,1) ,\; t>0, \\ u_x (\pm 1) = v_x (\pm 1) = 0 . \end{cases} \end{equation*}$
We concentrate on the case that
 $d, c, D>0$
are given constants,
 $g(x)$
is a given symmetric function, namely
 $g(x) = g(-x)$
, and
 $\varepsilon>0$
is sufficiently small and are interested in the effect of the heterogeneity
 $g(x)$
on the stability. For the case
 $g(x) = 1$
and
 $d = 0$
, Iron, Wei, and Winter (2004) studied the existence of
 $N-$
peaks symmetric stationary solutions and their stability. In this paper, first we construct symmetric one-peak stationary solutions
 $(u_{\varepsilon}, v_{\varepsilon})$
by using the contraction mapping principle. Furthermore, we give a linear stability analysis of the solutions
 $(u_{\varepsilon}, v_{\varepsilon})$
in details and reveal the effect of heterogeneity on the stability, which is a new phenomenon compared with the case
 $g(x) = 1$
.
Citation: Yuta Ishii, Kazuhiro Kurata. Existence and stability of one-peak symmetric stationary solutions for the Schnakenberg model with heterogeneity. Discrete & Continuous Dynamical Systems - A, 2019, 39 (5) : 2807-2875. doi: 10.3934/dcds.2019118
##### References:
 [1] S. Agmon, Lectures on Exponential Decay of Solutions of Second-Orderer Elliptic Equations, Princeton Univ. Press, 1982. [2] D. L. Benson, J. A. Sherrat and P. K. Maini, Diffusion driven instability in an inhomogeneous domain, Bull. of Math. Biology, 55 (1993), 365-384. [3] H. Brezis, Functional Analysis, Sobolev Spaces and Partial Differential Equations, Universitext, Springer, New York, 2011. [4] K. Ikeda, The existence and uniqueness of unstable eigenvalues for stripe patterns in the Gierer-Meinhardt system, Netw. Heterog. Media, 8 (2013), 291-325. doi: 10.3934/nhm.2013.8.291. [5] D. Iron, J. Wei and M. Winter, Stability analysis of Turing patterns generated by the Schnakenberg model, J. Math. Biol., 49 (2004), 358-390. doi: 10.1007/s00285-003-0258-y. [6] T. Kolokolnikov and J. Wei, Pattern formation in a reaction-diffusion system with space-dependent feed rate, SIAM Rev., 60 (2018), 626-645. doi: 10.1137/17M1116027. [7] E. H. Lieb and M. Loss, Analysis, Vol.14 of Graduate Studies in Mathematics, American Math. Society, 2001. doi: 10.1090/gsm/014. [8] P. Liu, J. Shi, Y. Wang and X. Feng, Bifurcation analysis of reaction-diffusion Scnakenberg model, J. Math. Chem., 51 (2013), 2001-2019. doi: 10.1007/s10910-013-0196-x. [9] K. Morimoto, Point-condensation phenomena and saturation effect for the one-dimensional Gierer-Meinhardt system, Ann. Inst. H. Poincaré Anal. Non Linéaire, 27 (2010), 973-995. doi: 10.1016/j.anihpc.2010.01.003. [10] J. Schnakenberg, Simple chemical reaction system with limit cycle behaviour, J. Theor. Biol., 81 (1979), 389-400. doi: 10.1016/0022-5193(79)90042-0. [11] A. M. Turing, The chemical basis of morphogenesis, Philos. Trans. R. Soc., B237 (1952), 37-72. [12] M. J. Ward and J. Wei, The existence and stability of asymmetric spike patterns for the Schnakenberg model, Stud. Appl. Math., 109 (2002), 229-264. doi: 10.1111/1467-9590.00223. [13] J. Wei, On single interior spike layer solutions of Gierer-Meinhardt system: uniqueness and spectrum estimates, Eur. J. Appl. Math., 10 (1999), 353-378. doi: 10.1017/S0956792599003770. [14] J. Wei and M. Winter, Stationary multiple spots for reaction-diffusion system, J. Math. Biol., 57 (2008), 53-89. doi: 10.1007/s00285-007-0146-y. [15] J. Wei and M. Winter, Mathematical Aspects of Pattern Formation in Biological Systems, Vol. 189 of Applied Mathematical Sciences, Springer, London, 2014. doi: 10.1007/978-1-4471-5526-3. [16] J. Wei and M. Winter, Stable spike clusters for the one-dimensional Gierer-Meinhardt system, Eur. J. Appl. Math., 28 (2017), 576-635. doi: 10.1017/S0956792516000450.

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##### References:
 [1] S. Agmon, Lectures on Exponential Decay of Solutions of Second-Orderer Elliptic Equations, Princeton Univ. Press, 1982. [2] D. L. Benson, J. A. Sherrat and P. K. Maini, Diffusion driven instability in an inhomogeneous domain, Bull. of Math. Biology, 55 (1993), 365-384. [3] H. Brezis, Functional Analysis, Sobolev Spaces and Partial Differential Equations, Universitext, Springer, New York, 2011. [4] K. Ikeda, The existence and uniqueness of unstable eigenvalues for stripe patterns in the Gierer-Meinhardt system, Netw. Heterog. Media, 8 (2013), 291-325. doi: 10.3934/nhm.2013.8.291. [5] D. Iron, J. Wei and M. Winter, Stability analysis of Turing patterns generated by the Schnakenberg model, J. Math. Biol., 49 (2004), 358-390. doi: 10.1007/s00285-003-0258-y. [6] T. Kolokolnikov and J. Wei, Pattern formation in a reaction-diffusion system with space-dependent feed rate, SIAM Rev., 60 (2018), 626-645. doi: 10.1137/17M1116027. [7] E. H. Lieb and M. Loss, Analysis, Vol.14 of Graduate Studies in Mathematics, American Math. Society, 2001. doi: 10.1090/gsm/014. [8] P. Liu, J. Shi, Y. Wang and X. Feng, Bifurcation analysis of reaction-diffusion Scnakenberg model, J. Math. Chem., 51 (2013), 2001-2019. doi: 10.1007/s10910-013-0196-x. [9] K. Morimoto, Point-condensation phenomena and saturation effect for the one-dimensional Gierer-Meinhardt system, Ann. Inst. H. Poincaré Anal. Non Linéaire, 27 (2010), 973-995. doi: 10.1016/j.anihpc.2010.01.003. [10] J. Schnakenberg, Simple chemical reaction system with limit cycle behaviour, J. Theor. Biol., 81 (1979), 389-400. doi: 10.1016/0022-5193(79)90042-0. [11] A. M. Turing, The chemical basis of morphogenesis, Philos. Trans. R. Soc., B237 (1952), 37-72. [12] M. J. Ward and J. Wei, The existence and stability of asymmetric spike patterns for the Schnakenberg model, Stud. Appl. Math., 109 (2002), 229-264. doi: 10.1111/1467-9590.00223. [13] J. Wei, On single interior spike layer solutions of Gierer-Meinhardt system: uniqueness and spectrum estimates, Eur. J. Appl. Math., 10 (1999), 353-378. doi: 10.1017/S0956792599003770. [14] J. Wei and M. Winter, Stationary multiple spots for reaction-diffusion system, J. Math. Biol., 57 (2008), 53-89. doi: 10.1007/s00285-007-0146-y. [15] J. Wei and M. Winter, Mathematical Aspects of Pattern Formation in Biological Systems, Vol. 189 of Applied Mathematical Sciences, Springer, London, 2014. doi: 10.1007/978-1-4471-5526-3. [16] J. Wei and M. Winter, Stable spike clusters for the one-dimensional Gierer-Meinhardt system, Eur. J. Appl. Math., 28 (2017), 576-635. doi: 10.1017/S0956792516000450.
For $D = 0.6$, the solution is stable
For $D_1 > D = \frac{1}{24}-0.02$, the solution is stable. For $D_1 < D = \frac{1}{24}+0.02$, the solution is unstable
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