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arXiv 1907.09403math.AP
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半线性椭圆型方程的稳定解到9维是光滑的

Stable solutions to semilinear elliptic equations are smooth up to dimension 9

Xavier Cabre, Alessio Figalli, Xavier Ros-Oton, Joaquim Serra

摘要:

本文证明了一个长期存在的猜想:半线性椭圆型方程的稳定解在维数$n \leq 9$上是有界的(因而是光滑的).这个结果,只对$n\leq4$成立,是最优的:$\log(1/|x|^2)$是$n\geq10$的$W^{1,2}$奇异稳定解。这个猜想的证明是一个新的普遍估计的后果:我们证明,在尺寸$n \leq 9$,稳定的解决方案是有界的,只有他们的$L^1$规范,独立的非线性。此外,在每一个维度,我们建立了更高的可积性结果的梯度和最佳可积性结果的了解在Morrey空间。通过一系列经典的例子可以看出,我们的结果都是精确的。作为推论,我们还得到了Gelfand问题的极值解在每一维上都是$W^{1,2}$,并且在维数$n \leq 9$上是光滑的.这回答了Brezis和Brezis-Vázquez提出的两个著名的开放问题。

英文摘要:

In this paper we prove the following long-standing conjecture: stable solutions to semilinear elliptic equations are bounded (and thus smooth) in dimension $n \leq 9$. This result, that was only known to be true for $n\leq4$, is optimal: $\log(1/|x|^2)$ is a $W^{1,2}$ singular stable solution for $n\geq10$. The proof of this conjecture is a consequence of a new universal estimate: we prove that, in dimension $n \leq 9$, stable solutions are bounded in terms only of their $L^1$ norm, independently of the nonlinearity. In addition, in every dimension we establish a higher integrability result for the gradient and optimal integrability results for the solution in Morrey spaces. As one can see by a series of classical examples, all our results are sharp. Furthermore, as a corollary we obtain that extremal solutions of Gelfand problems are $W^{1,2}$ in every dimension and they are smooth in dimension $n \leq 9$. This answers to two famous open problems posed by Brezis and Brezis-Vázquez.

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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