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arXiv 1012.0867math.AP
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分数拉普拉斯算子的非线性方程I:正则性、最大值原理和哈密顿估计

Nonlinear equations for fractional Laplacians I: Regularity, maximum principles, and Hamiltonian estimates

Xavier Cabre, Yannick Sire

摘要:

这是两篇文章中的第一篇,涉及方程$(-Δ)^{s} v= f(v)$在$\mathbb{R}^{n}$,与$s\in (0,1)$,其中$(-Δ)^{s}$代表分数拉普拉斯算子-无穷小发电机的一个列维过程。该方程可以在$\mathbb{R}^{n+1}_+$中实现为一个局部线性退化椭圆型方程,并在$\partial \mathbb{R}^{n+1}_+=\mathbb{R}^{n}$中实现为一个非线性Neumann边界条件。在这第一篇文章中,我们建立了非线性$f$允许某些类型的解的必要条件,特别是在所有的$\mathbb{R}$有界增长的解决方案的兴趣。这些必要条件(这将在后续文件中证明也是足够的存在一个有界增加的解决方案)是来自一个等式和一个估计涉及一个哈密尔顿-在精神的结果Modica的拉普拉斯算子。此外,我们还研究了正则性问题,以及与方程相关的最大值和Harnack原理。

英文摘要:

This is the first of two articles dealing with the equation $(-Δ)^{s} v= f(v)$ in $\mathbb{R}^{n}$, with $s\in (0,1)$, where $(-Δ)^{s}$ stands for the fractional Laplacian ---the infinitesimal generator of a Lévy process. This equation can be realized as a local linear degenerate elliptic equation in $\mathbb{R}^{n+1}_+$ together with a nonlinear Neumann boundary condition on $\partial \mathbb{R}^{n+1}_+=\mathbb{R}^{n}$. In this first article, we establish necessary conditions on the nonlinearity $f$ to admit certain type of solutions, with special interest in bounded increasing solutions in all of $\mathbb{R}$. These necessary conditions (which will be proven in a follow-up paper to be also sufficient for the existence of a bounded increasing solution) are derived from an equality and an estimate involving a Hamiltonian ---in the spirit of a result of Modica for the Laplacian. In addition, we study regularity issues, as well as maximum and Harnack principles associated to the equation.

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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