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arXiv 1207.5986math.AP
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分数拉普拉斯算子的Pohozaev恒等式

The Pohozaev identity for the fractional Laplacian

Xavier Ros-Oton, Joaquim Serra

摘要:

本文证明了半线性Dirichlet问题$(-Δ)^s u = f(u)$ in $Ω$,$u \equiv 0$ in $\mathbb R^n\setminusΩ$的Pohozaev恒等式.这里,$s\in(0,1)$,$(-Δ)^s$是$\mathbb R^n$中的分数拉普拉斯算子,$Ω$是有界$C^{1,1}$域。为了建立恒等式,我们使用,除其他外,如果$u$是有界解,则$u/δ^s|_Ω$是$C^α$,直到边界$\partialΩ$,其中$δ(x)={\rm dist}(x,\partialΩ)$。在分数Pohozaev恒等式中,函数$u/δ^s|_{\partialΩ}$起着$\partial u/\partialν$在经典恒等式中所起的作用。令人惊讶的是,从一个非局部的问题,我们得到一个身份的边界项(积分超过$\partialΩ$),这是完全本地的。作为我们的身份的应用,我们推导出非平凡的解决方案,在星形域的超临界非线性。

英文摘要:

In this paper we prove the Pohozaev identity for the semilinear Dirichlet problem $(-Δ)^s u = f(u)$ in $Ω$, $u \equiv 0$ in $\mathbb R^n\setminusΩ$. Here, $s\in(0,1)$, $(-Δ)^s$ is the fractional Laplacian in $\mathbb R^n$, and $Ω$ is a bounded $C^{1,1}$ domain. To establish the identity we use, among other things, that if $u$ is a bounded solution then $u/δ^s|_Ω$ is $C^α$ up to the boundary $\partialΩ$, where $δ(x)={\rm dist}(x,\partialΩ)$. In the fractional Pohozaev identity, the function $u/δ^s|_{\partialΩ}$ plays the role that $\partial u/\partialν$ plays in the classical one. Surprisingly, from a nonlocal problem we obtain an identity with a boundary term (an integral over $\partialΩ$) which is completely local. As an application of our identity, we deduce the nonexistence of nontrivial solutions in star-shaped domains for supercritical nonlinearities.

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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