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arXiv 1708.04660math.AP
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具有临界指数的双调和椭圆型方程的Delaunay解

On Delaunay solutions of a biharmonic elliptic equation with critical exponent

Zongming Guo, Xia Huang, Liping Wang, Juncheng Wei

摘要:

我们对方程\begin{equation} \label{0.0} Δ^2 u=u^{\frac{n+4}{n-4}} \;\;\mbox{in $\mathbb{R}^n \backslash \{0\}$ and 0 is a non-removable singularity of $u(x)$}. \end{equation}的正整解$u \in C^4 (\mathbb{R}^n \backslash \{0\})$的定性性质感兴趣。由[定理4.2]可知,\eqref{0.0}的任何正整解$u$关于$x=0$是径向对称的,即$u(x)=u(|x|)$,并且方程\eqref{0.0}还存在一个特殊的正整解$u_s (x)=\Big(\frac{n^2 (n-4)^2}{16} \Big)^{\frac{n-4}{8}} |x|^{-\frac{n-4}{2}}$。我们首先表明,$u-u_s$改变符号无穷多次在$(0, \infty)$的任何正奇异的整体解决方案$u \not \equiv u_s$在$\mathbb{R}^N \backslash \{0\}$的\eqref{0.0}。此外,方程\eqref{0.0}允许正的整体奇异解$u(x) \; (=u(|x|)$,使得具有共形因子$u^{\frac{4}{n-4}}$的共形度量的标量曲率是正的,并且$v(t):=e^{\frac{n-4}{2} t} u(e^t)$是$2T$ -周期的,具有适当大的$T$。对于\eqref{0.0}的任意正整解$u(x)$,$v(t):=e^{\frac{n-4}{2} t} u(e^t)$是周期的这一问题还没有定论.

英文摘要:

We are interested in the qualitative properties of positive entire solutions $u \in C^4 (\mathbb{R}^n \backslash \{0\})$ of the equation \begin{equation} \label{0.0} Δ^2 u=u^{\frac{n+4}{n-4}} \;\;\mbox{in $\mathbb{R}^n \backslash \{0\}$ and 0 is a non-removable singularity of $u(x)$}. \end{equation} It is known from [Theorem 4.2] that any positive entire solution $u$ of \eqref{0.0} is radially symmetric with respect to $x=0$, i.e. $u(x)=u(|x|)$, and equation \eqref{0.0} also admits a special positive entire solution $u_s (x)=\Big(\frac{n^2 (n-4)^2}{16} \Big)^{\frac{n-4}{8}} |x|^{-\frac{n-4}{2}}$. We first show that $u-u_s$ changes signs infinitely many times in $(0, \infty)$ for any positive singular entire solution $u \not \equiv u_s$ in $\mathbb{R}^N \backslash \{0\}$ of \eqref{0.0}. Moreover, equation \eqref{0.0} admits a positive entire singular solution $u(x) \; (=u(|x|)$ such that the scalar curvature of the conformal metric with conformal factor $u^{\frac{4}{n-4}}$ is positive and $v(t):=e^{\frac{n-4}{2} t} u(e^t)$ is $2T$-periodic with suitably large $T$. It is still open that $v(t):=e^{\frac{n-4}{2} t} u(e^t)$ is periodic for any positive entire solution $u(x)$ of \eqref{0.0}.

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