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arXiv 1507.01360math.AP
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Lane-Emden问题节点径向解的精确Morse指数计算

Exact Morse index computation for nodal radial solutions of Lane-Emden problems

Francesca De Marchis, Isabella Ianni, Filomena Pacella

摘要:

本文考虑半线性Lane-Emden问题\begin{equation}\label{problemAbstract} \left\{\begin{array}{lr}-Δu= |u|^{p-1}u\qquad \mbox{ in }B u=0\qquad\qquad\qquad\mbox{ on }\partial B \end{array}\right.\tag{$\mathcal E_p$} \end{equation},其中$B$是$\mathbb R^N$,$N\geq2$和$1<p<p_S$的单位球,若$N=2$为$p_S=+\infty$,若$N\geq3$为$p_S=\frac{N+2}{N-2}$.我们的主要结果是证明了在维数$N=2$上,当$p$足够大时,\eqref{problemAbstract}的最小能量变号径向解$u_p$的Morse指数恰为$12$.作为一个中间步骤,我们明确计算的第一个特征值的极限加权问题在$\mathbb R^N$在任何尺寸$N\geq2$。

英文摘要:

We consider the semilinear Lane-Emden problem \begin{equation}\label{problemAbstract} \left\{\begin{array}{lr}-Δu= |u|^{p-1}u\qquad \mbox{ in }B u=0\qquad\qquad\qquad\mbox{ on }\partial B \end{array}\right.\tag{$\mathcal E_p$} \end{equation} where $B$ is the unit ball of $\mathbb R^N$, $N\geq2$, centered at the origin and $1<p<p_S$, with $p_S=+\infty$ if $N=2$ and $p_S=\frac{N+2}{N-2}$ if $N\geq3$. Our main result is to prove that in dimension $N=2$ the Morse index of the least energy sign-changing radial solution $u_p$ of \eqref{problemAbstract} is exactly $12$ if $p$ is sufficiently large. As an intermediate step we compute explicitly the first eigenvalue of a limit weighted problem in $\mathbb R^N$ in any dimension $N\geq2$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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