T1 theorem on product Carnot-Caratheodory spaces

Abstract

Nagel and Stein established $L^p$-boundedness for a class of singular integrals of NIS type, that is, non-isotropic smoothing operators of order 0, on spaces $\tilde{M}=M_1\times ...\times M_n,$ where each factor space $M_i,1\le i\le n,$ is a smooth manifold on which the basic geometry is given by a control, or Carnot--Carathéodory, metric induced by a collection of vector fields of finite type. In this paper we prove the product $T1$ theorem on $L^2,$ the Hardy space $H^p(\tilde{M})$ and the space $CM{O}^p(\tilde{M})$, the dual of $H^p(\tilde{M}),$ for a class of product singular integral operators which covers Journé's class and operators studied by Nagel and Stein.

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