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arXiv 1503.07290math.AP
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可测系数Stokes系统的格林函数

The Green function for the Stokes system with measurable coefficients

Jongkeun Choi, Ki-Ahm Lee

摘要:

研究了有界Lipschitz区域$Ω\subset \mathbb{R}^n$,$n\ge 3$中具有有界可测系数的定常Stokes系统的格林函数.在$(\bf{A1})$弱解具有内部Hölder连续性的条件下,构造了$Ω$中的格林函数.我们还证明了$(\bf{A1})$成立,例如,当系数是$\mathrm{VMO}$。此外,在Dirichlet问题的弱解局部有界到区域边界的附加假设$(\bf{A2})$下,得到了格林函数的整体逐点估计.通过证明Reifenberg域上具有$\mathrm{BMO}$系数的Stokes系统的先验$L^q$ -估计,证明了当系数为$\mathrm{VMO}$且$Ω$为有界$C^1$域时,$(\bf{A2})$满足.

英文摘要:

We study the Green function for the stationary Stokes system with bounded measurable coefficients in a bounded Lipschitz domain $Ω\subset \mathbb{R}^n$, $n\ge 3$. We construct the Green function in $Ω$ under the condition $(\bf{A1})$ that weak solutions of the system enjoy interior Hölder continuity. We also prove that $(\bf{A1})$ holds, for example, when the coefficients are $\mathrm{VMO}$. Moreover, we obtain the global pointwise estimate for the Green function under the additional assumption $(\bf{A2})$ that weak solutions of Dirichlet problems are locally bounded up to the boundary of the domain. By proving a priori $L^q$-estimates for Stokes systems with $\mathrm{BMO}$ coefficients on a Reifenberg domain, we verify that $(\bf{A2})$ is satisfied when the coefficients are $\mathrm{VMO}$ and $Ω$ is a bounded $C^1$ domain.

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