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arXiv 1107.2971math.CAmath.FA
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$\mathbb{R}^n$中无界强Lipschitz域上与发散算子相关的Orlicz-Hardy空间

Orlicz-Hardy Spaces Associated with Divergence Operators on Unbounded Strongly Lipschitz Domains of $\mathbb{R}^n$

Dachun Yang, Sibei Yang

摘要:

设$Ω$是$\mathbb{R}^n$或$\mathbb{R}^n$的无界强Lipschitz整环,$Φ$是$(0,\infty)$上的连续、严格增、次可加的正函数,其上型为1,下型为严格临界$p_Φ\in(n/(n+1),1]$ .设$L$是具有Neumann边界条件的$L^2 (Ω)$上的一个发散型椭圆算子,由它生成的热半群具有Gauss性质$(G_{\infty})$ .本文通过与$\{e^{-t\sqrt{L}}\}_{t\ge0}$相联系的非切极大函数引入Orlicz-Hardy空间$H_{Φ,\,L}(Ω)$,并建立了它与$\{e^{-t\sqrt{L}}\}_{t\ge0}$相联系的Lusin面积函数的等价刻画.由经典的Orlicz-Hardy空间$H_Φ(\mathbb{R}^n)$引入了“几何”Orlicz-Hardy空间$H_{Φ,\,z}(Ω)$,证明了$H_{Φ,\,L}(Ω)$与$H_{Φ,\,z}(Ω)$具有等价的范数,并由此导出了$H_{Φ,\,L}(Ω)$的特征,包括与$\{e^{-tL}\}_{t\ge0}$相关的垂直和非切极大函数特征,以及与$\{e^{-tL}\}_{t\ge0}$相关的Lusin面积函数特征.上述结果推广了P. Auscher和E. Russ通过服用$Φ(t)\equiv t$代替所有$t\in(0,\infty)$。

英文摘要:

Let $Ω$ be either $\mathbb{R}^n$ or an unbounded strongly Lipschitz domain of $\mathbb{R}^n$, and $Φ$ be a continuous, strictly increasing, subadditive and positive function on $(0,\infty)$ of upper type 1 and of strictly critical lower type $p_Φ\in(n/(n+1),1]$. Let $L$ be a divergence form elliptic operator on $L^2 (Ω)$ with the Neumann boundary condition and the heat semigroup generated by $L$ have the Gaussian property $(G_{\infty})$. In this paper, the authors introduce the Orlicz-Hardy space $H_{Φ,\,L}(Ω)$ via the nontangential maximal function associated with $\{e^{-t\sqrt{L}}\}_{t\ge0}$, and establish its equivalent characterization in terms of the Lusin area function associated with $\{e^{-t\sqrt{L}}\}_{t\ge0}$. The authors also introduce the "geometrical" Orlicz-Hardy space $H_{Φ,\,z}(Ω)$ via the classical Orlicz-Hardy space $H_Φ(\mathbb{R}^n)$, and prove that the spaces $H_{Φ,\,L}(Ω)$ and $H_{Φ,\,z}(Ω)$ coincide with equivalent norms, from which, characterizations of $H_{Φ,\,L}(Ω)$, including the vertical and the nontangential maximal function characterizations associated with $\{e^{-tL}\}_{t\ge0}$, and the Lusin area function characterization associated with $\{e^{-tL}\}_{t\ge0}$, are deduced. All the above results generalize the well-known results of P. Auscher and E. Russ by taking $Φ(t)\equiv t$ for all $t\in(0,\infty)$.

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