Sharp estimates, uniqueness and nondegeneracy of positive solutions of the Lane-Emden system in planar domains
Zhijie Chen, Houwang Li, Wenming Zou · arXiv (Cornell University) · 2022
We study the Lane-Emden system $$\begin{cases} -Δu=v^p,\quad u>0,\quad\text{in}~Ω, -Δv=u^q,\quad v>0,\quad\text{in}~Ω, u=v=0,\quad\text{on}~\partialΩ, \end{cases}$$ where $Ω\subset\mathbb{R}^2$ is a smooth bounded domain. In a recent work, we studied the concentration phenomena of positive solutions as $p,q\to+\infty$ and $|q-p|\leq Λ$. In this paper, we obtain sharp estimates of such multi-bubble solutions, including sharp convergence rates of local maxima and scaling parameters, and accurate approximations of solutions. As an application of these sharp estimates, we show that when $Ω$ is convex, then the solution of this system is unique and nondegenerate for large $p, q$.