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arXiv 2009.02069math.AP
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$\mathbb{S}^n$上共形$Q$ -曲率方程的大奇异解

Large singular solutions for conformal $Q$-curvature equations on $\mathbb{S}^n$

Xusheng Du, Hui Yang

摘要:

本文研究了正函数$K \in C^1(\mathbb{S}^n)$的存在性,使得共形$Q$ -曲率方程\begin{equation} \label{001} P_m(v)= Kv ^{ \frac{n+2m}{n-2m} }~~ {on} ~ \mathbb{S}^n \{equation}存在奇异正解$v$,其奇异集为单点,其中$m$是满足$1 \leq m < n/2$的整数,$P_m$是$2m$阶的交织算子。更具体地说,我们表明,当$n\geq 2m+4$,在$C^1(\mathbb{S}^n)$中的每一个正函数可以近似的$C^1(\mathbb{S}^n)$规范的正函数$K\in C^1(\mathbb{S}^n)$,使共形$Q$曲率方程有一个奇异的正解,其奇异集是一个单点。此外,这样的解可以构造成在其奇点附近任意大。这与Lin \cite{Lin1998}和Wei-Xu \cite{Wei1999}的著名结果相反,他们证明了当$K$为$\mathbb{S}^n$,$n > 2m$上的正常数时,共形$Q$ -曲率方程不存在奇异正解,其奇异集为单点.

英文摘要:

In this paper, we study the existence of positive functions $K \in C^1(\mathbb{S}^n)$ such that the conformal $Q$-curvature equation \begin{equation}\label{001} P_m (v) =K v^{\frac{n+2m}{n-2m}}~~~~~~ {on} ~ \mathbb{S}^n \{equation} has a singular positive solution $v$ whose singular set is a single point, where $m$ is an integer satisfying $1 \leq m < n/2$ and $P_m$ is the intertwining operator of order $2m$. More specifically, we show that when $n\geq 2m+4$, every positive function in $C^1(\mathbb{S}^n)$ can be approximated in the $C^1(\mathbb{S}^n)$ norm by a positive function $K\in C^1(\mathbb{S}^n)$ such that the conformal $Q$-curvature equation has a singular positive solution whose singular set is a single point. Moreover, such a solution can be constructed to be arbitrarily large near its singularity. This is in contrast to the well-known results of Lin \cite{Lin1998} and Wei-Xu \cite{Wei1999} which show that the conformal $Q$-curvature equation, with $K$ identically a positive constant on $\mathbb{S}^n$, $n > 2m$, does not exist a singular positive solution whose singular set is a single point.

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