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arXiv 0908.1559math.PR
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$Δ+ Δ^{α/2}$的边界Harnack原理

Boundary Harnack principle for $Δ+ Δ^{α/2}$

Zhen-Qing Chen, Panki Kim, Renming Song, Zoran Vondraček

摘要:

对于$d\geq 1$和$α\in (0, 2)$,考虑$\R^d$上的伪微分算子族$\{Δ+ b Δ^{α/2}; b\in [0, 1]\}$,其从$Δ$连续演化到$Δ+ Δ^{α/2}$。本文建立了$C^{1, 1}$开集中关于$Δ+b Δ^{α/2}$(或等价地,布朗运动与独立的对称$α$ -具有常重$b^{1/α}$的稳定过程之和)调和的非负函数的具有显式边界衰减率的一致边界Harnack原理(BHP).这里,“均匀”BHP意味着BHP中的比较常数与$b\in [0, 1]$无关。在此基础上,建立了Lipschitz开集上关于$Δ+ b Δ^{α/2}$调和的非负函数的一致Carleson型估计.我们的方法采用概率和分析技术相结合。

英文摘要:

For $d\geq 1$ and $α\in (0, 2)$, consider the family of pseudo differential operators $\{Δ+ b Δ^{α/2}; b\in [0, 1]\}$ on $\R^d$ that evolves continuously from $Δ$ to $Δ+ Δ^{α/2}$. In this paper, we establish a uniform boundary Harnack principle (BHP) with explicit boundary decay rate for nonnegative functions which are harmonic with respect to $Δ+b Δ^{α/2}$ (or equivalently, the sum of a Brownian motion and an independent symmetric $α$-stable process with constant multiple $b^{1/α}$) in $C^{1, 1}$ open sets. Here a "uniform" BHP means that the comparing constant in the BHP is independent of $b\in [0, 1]$. Along the way, a uniform Carleson type estimate is established for nonnegative functions which are harmonic with respect to $Δ+ b Δ^{α/2}$ in Lipschitz open sets. Our method employs a combination of probabilistic and analytic techniques.

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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