Multiparameter Hardy space theory on Carnot-Carathéodory spaces and product spaces of homogeneous type

Han, Yongsheng; Li, Ji; Lu, Guozhen

doi:10.1090/S0002-9947-2012-05638-8

Multiparameter Hardy space theory on Carnot-Carathéodory spaces and product spaces of homogeneous type
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by Yongsheng Han, Ji Li and Guozhen Lu PDF

Trans. Amer. Math. Soc. 365 (2013), 319-360 Request permission

Abstract:

This paper is inspired by the work of Nagel and Stein in which the $L^p$ $(1<p<\infty )$ theory has been developed in the setting of the product Carnot-Carathéodory spaces $\widetilde {M}=M_1\times \cdots \times M_n$ formed by vector fields satisfying Hörmander’s finite rank condition. The main purpose of this paper is to provide a unified approach to develop the multiparameter Hardy space theory on product spaces of homogeneous type. This theory includes the product Hardy space, its dual, the product $BMO$ space, the boundedness of singular integral operators and Calderón-Zygmund decomposition and interpolation of operators. As a consequence, we obtain the endpoint estimates for those singular integral operators considered by Nagel and Stein (2004). In fact, we will develop most of our theory in the framework of product spaces of homogeneous type which only satisfy the doubling condition and some regularity assumption on the metric. All of our results are established by introducing certain Banach spaces of test functions and distributions, developing discrete Calderón identity and discrete Littlewood-Paley-Stein theory. Our methods do not rely on the Journé-type covering lemma which was the main tool to prove the boundedness of singular integrals on the classical product Hardy spaces.

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