Solutions for a critical elliptic system with periodic boundary condition

Qingfang Wang; Wenju Wu; Mingxue Zhai

doi:10.3934/dcds.2025091

Article Contents

2026, Volume 46: 40-79. Doi: 10.3934/dcds.2025091

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Solutions for a critical elliptic system with periodic boundary condition

1.
School of Mathematics and Computer Science, Wuhan Polytechnic University, Wuhan, 430023, China
2.
School of Mathematics and Statistics, Central China Normal University, Wuhan, 430079, China

^*Corresponding author: Wenju Wu
^*Corresponding author: Wenju Wu

Received: February 2025

Early access: June 20, 2025

Published online: June 20, 2025

The first author is supported by [NSFC (No. 12126356)]. The second and third authors are supported by [NSFC (No. 12471106)].

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Abstract

In this paper, we consider the following nonlinear critical Schrödinger system:

$ \begin{eqnarray*} \begin{cases} -\Delta u = K_1(y)u^{2^*-1}+\frac{1}{2} u^{\frac{2^*}{2}-1}v^\frac{2^*}{2}, \, \, \, \, \, y\in\Omega, \, \, \, \, \, u>0, \cr -\Delta v = K_2(y)v^{2^*-1}+\frac{1}{2} v^{\frac{2^*}{2}-1}u^\frac{2^*}{2}, \, \, \, \, \, y\in\Omega, \, \, \, \, \, v>0, \cr u(y'+Le_j, y'') = u(y), \, \, \frac{\partial u(y'+Le_j, y'')}{\partial y_j} = \frac{\partial u(y)}{\partial y_j}, \, \, if\, \, y' = -\frac{L}{2}e_j, \, \, j = 1, \ldots, k, \cr v(y'+Le_j, y'') = v(y), \, \, \frac{\partial v(y'+Le_j, y'')}{\partial y_j} = \frac{\partial v(y)}{\partial y_j}, \, \, if\, \, y' = -\frac{L}{2}e_j, \, \, j = 1, \ldots, k, \cr u, v \to 0 \, \, as \, \, |y''|\to \infty, \end{cases} \end{eqnarray*} $

where $ K_1(y), \, K_2(y) $ satisfy some periodic conditions and $ \Omega $ is a strip. Under some conditions which are weaker than Li, Wei and Xu (J. Reine Angew. Math. 743: 163-211, 2018), we prove that there exists a single bubbling solution for the above system. Moreover, as the appearance of the coupling terms, we construct different forms of solutions, which makes it more interesting. Since there are periodic boundary conditions, this expansion for the difference between the standard bubbles and the approximate bubble can not be obtained by using the comparison theorem as one usually does for Dirichlet boundary condition. To overcome this difficulty, we will use the Green's function of $ -\Delta $ in $ \Omega $ with periodic boundary conditions which helps us find the approximate bubble. Due to the lack of the Sobolev inequality, we will introduce a suitable weighted space to carry out the reduction.

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Mathematics Subject Classification: Primary: 35J60; Secondary: 35B33.

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