Classification of Solutions to a Critically Nonlinear System of Elliptic Equations on Euclidean Half-Space

Abstract

For $N\ge 3$ and non-negative real numbers $a_{ij}$ and $b_{ij}$ ($i,j=1,\cdots ,m$), the semi-linear elliptic system \begin{equation*} \begin{cases} Δu_i + \prod_{j = 1}^m u_j^{a_{ij}} = 0 & \text{ in } \mathbb R_+^N, \frac{\partial u_i}{\partial y_N} = c_i \prod_{j = 1}^m u_j^{b_{ij}} & \text{ on } \partial \mathbb R_+^N \end{cases} \qquad i = 1, \cdots, m \end{equation*} % is considered, where ${\mathbb{R}}_{+}^N$ is the upper half of $N$-dimensional Euclidean space. Under suitable assumptions on the exponents $a_{ij}$ and $b_{ij}$, a classification theorem for the positive $C^2({\mathbb{R}}_{+}^N)\cap C^1(\overline{{\mathbb{R}}_{+}^N})$-solutions of this system is proven.

arXiv comment17 pages, 1 figure