arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1904.04722math.AP
收藏

无界区域中带低阶项的椭圆方程的正则性理论与格林函数

Regularity theory and Green's function for elliptic equations with lower order terms in unbounded domains

Mihalis Mourgoglou

AI总结:

研究无界区域中带低阶项的散度型椭圆算子,在系数仅有界、非对称等弱假设下建立De Giorgi/Nash/Moser正则性理论、边界正则Wiener准则,证明变分Dirichlet问题适定性并构造带定量估计的格林函数,结果具尺度不变性且不依赖区域与系数小性假设。

摘要:

我们在勒贝格测度可能为无穷的开集$Ω\subset \mathbb{R}^n$($n\geq 3$)中,研究形如$Lu=-$div$\nabla u+bu)-c\nabla u-du$的带低阶项的散度型椭圆算子。我们假设$n\times n$矩阵$A$是一致椭圆的,其系数为实值、仅有界且可能非对称,且满足$b,c\in L^{n,\infty}_{loc}(Ω)$与$d\in L_{loc}^{\frac{n}{2},\infty}(Ω)$,或$|b|^2,|c|^2,|d|\in \mathcal{K}_{loc}(Ω)$,其中$\mathcal{K}_{loc}(Ω)$表示局部Stummel-Kato类。设$\mathcal{K}_{Dini}(Ω)$是满足Carleson-Dini型条件的$\mathcal{K}(Ω)$的一个变体。对于$Lu=f-$div$g$的解,若$|f|$且$|g|^2\in \mathcal{K}_{Dini}(Ω)$,且对$q\in [n, \infty)$,满足以下任一假设:a) $|b|^2,|d|\in \mathcal{K}_{Dini}(Ω)$且$c\in L^{n,q}_{loc}(Ω)$或$|c|^2\in \mathcal{K}_{loc}(Ω)$;b) div$b +d \leq 0$且$b+c\in L^{n,q}_{loc}(Ω)$或$|b+c|^2\in \mathcal{K}_{loc}(Ω)$;c) $-$div$c+d \leq 0$且$|b+c|^2\in \mathcal{K}_{Dini}(Ω)$,我们建立了De Giorgi/Nash/Moser理论。我们还证明了边界正则性的Wiener型准则。在系数满足全局条件的假设下,我们证明了变分Dirichlet问题是适定的;在假设$-$div$c+d\leq 0$的条件下,我们构造了与$L$相关的满足定量估计的格林函数。在附加假设$|b+c|^2\in \mathcal{K}'(Ω)$下,我们证明该格林函数满足全局逐点界,并构造了与$L$的形式伴随算子相关的格林函数。我们结果的一个重要特征是,所有估计都是尺度不变的,且与$Ω$无关,同时我们不假设系数的范数很小,也不假设双线性型具有强制性。

英文摘要:

We consider elliptic operators in divergence form with lower order terms of the form $Lu=-$div$\nabla u+bu)-c\nabla u-du$, in an open set $Ω\subset \mathbb{R}^n$, $n\geq 3$, with possibly infinite Lebesgue measure. We assume that the $n\times n$ matrix $A$ is uniformly elliptic with real, merely bounded and possibly non-symmetric coefficients, and either $b,c\in L^{n,\infty}_{loc}(Ω)$ and $d\in L_{loc}^{\frac{n}{2},\infty}(Ω)$, or $|b|^2,|c|^2,|d|\in \mathcal{K}_{loc}(Ω)$, where $\mathcal{K}_{loc}(Ω)$ stands for the local Stummel-Kato class. Let $\mathcal{K}_{Dini}(Ω)$ be a variant of $\mathcal{K}(Ω)$ satisfying a Carleson-Dini-type condition. We develop a De Giorgi/Nash/Moser theory for solutions of $Lu=f-$div$g$, where $|f|$ and $|g|^2\in \mathcal{K}_{Dini}(Ω)$ if, for $q\in [n, \infty)$, any of the following assumptions holds: a) $|b|^2,|d|\in \mathcal{K}_{Dini}(Ω)$ and either $c\in L^{n,q}_{loc}(Ω)$ or $|c|^2\in \mathcal{K}_{loc}(Ω)$; b) div$b +d \leq 0$ and either $b+c\in L^{n,q}_{loc}(Ω)$ or $|b+c|^2\in \mathcal{K}_{loc}(Ω)$; c) $-$div$c+d \leq 0$ and $|b+c|^2\in \mathcal{K}_{Dini}(Ω)$. We also prove a Wiener-type criterion for boundary regularity. Assuming global conditions on the coefficients, we show that the variational Dirichlet problem is well-posed and, assuming $-$div$c+d\leq 0$, we construct the Green's function associated with $L$ satisfying quantitative estimates. Under the additional hypothesis $|b+c|^2\in \mathcal{K}'(Ω)$, we show that it satisfies global pointwise bounds and also construct the Green's function associated with the formal adjoint operator of $L$. An important feature of our results is that all the estimates are scale invariant and independent of $Ω$, while we do not assume smallness of the norms of the coefficients or coercivity of the bilinear form.

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。

↑