Weighted Anisotropic Product Hardy Spaces and Boundedness of Sublinear Operators

Details Weighted Anisotropic Product Hardy Spaces and Boundedness of Sublinear Operators Weighted Anisotropic Product Hardy Spaces and Boundedness of Sublinear Operators

2009-03-23

arxiv.org/abs/0903.3775v2

Mathematics

Classical Analysis and ODEs

Math. Nachr. (to appear)

Scientific paper

Let $A_1$ and $A_2$ be expansive dilations, respectively, on ${\mathbb R}^n$ and ${\mathbb R}^m$. Let $\vec A\equiv(A_1, A_2)$ and $\mathcal A_p(\vec A)$ be the class of product Muckenhoupt weights on ${\mathbb R}^n\times{\mathbb R}^m$ for $p\in(1, \infty]$. When $p\in(1, \infty)$ and $w\in{\mathcal A}_p(\vec A)$, the authors characterize the weighted Lebesgue space $L^p_w({\mathbb R}^n\times{\mathbb R}^m)$ via the anisotropic Lusin-area function associated with $\vec A$. When $p\in(0, 1]$, $w\in {\mathcal A}_\infty(\vec A)$, the authors introduce the weighted anisotropic product Hardy space $H^p_w({\mathbb R}^n\times{\mathbb R}^m; \vec A)$ via the anisotropic Lusin-area function and establish its atomic decomposition. Moreover, the authors prove that finite atomic norm on a dense subspace of $H^p_w({\mathbb R}^n\times{\mathbb R}^m;\vec A)$ is equivalent with the standard infinite atomic decomposition norm. As an application, the authors prove that if $T$ is a sublinear operator and maps all atoms into uniformly bounded elements of a quasi-Banach space $\mathcal B $, then $T$ uniquely extends to a bounded sublinear operator from $H^p_w({\mathbb R}^n\times{\mathbb R}^m;\vec A)$ to $\mathcal B$. The results of this paper improve the existing results for weighted product Hardy spaces and are new even in the unweighted anisotropic setting.

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