Electron. J. Diff. Equ., Vol. 2016 (2016), No. 103, pp. 1-21.

Multi-peak solutions for a planar Robin nonlinear elliptic problem with large exponent

Yibin Zhang, Lei Shi

Abstract:
We consider the elliptic equation $\Delta u+u^p=0$ in a bounded smooth domain $\Omega$ in $\mathbb{R}^2$ subject to the Robin boundary condition $\frac{\partial u}{\partial\nu} +\lambda b(x)u=0$. Here $\nu$ denotes the unit outward normal vector on $\partial\Omega$, $b(x)$ is a smooth positive function defined on $\partial\Omega$, $0<\lambda<+\infty$, and p is a large exponent. For any fixed $\lambda$ large we find topological conditions on $\Omega$ which ensure the existence of a positive solution with exactly m peaks separated by a uniform positive distance from the boundary and each from other as $p\to+\infty$ and $\lambda\to+\infty$. In particular, for a nonsimply connected domain such solution exists for any $m\geq 1$.

Submitted November 26, 2015. Published April 21, 2016.
Math Subject Classifications: 35J25, 35B25, 35B38.
Key Words: Concentrating solutions; large exponent; Robin boundary condition; finite-dimensional reduction.

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Yibin Zhang
College of Sciences
Nanjing Agricultural University
Nanjing 210095, China
email: yibin10201029@njau.edu.cn
  Lei Shi
College of Sciences
Nanjing Agricultural University
Nanjing 210095, China
email: shileijsxh@163.com

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