Weighted Hardy spaces associated with elliptic operators. Part I: Weighted norm inequalities for conical square functions

Abstract

This is the first part of a series of three articles. In this paper, we obtain weighted norm inequalities for different conical square functions associated with the Heat and the Poisson semigroups generated by a second order divergence form elliptic operator with bounded complex coefficients. We find classes of Muckenhoupt weights where the square functions are comparable and/or bounded. These classes are natural from the point of view of the ranges where the unweighted estimates hold. In doing that, we obtain sharp weighted change of angle formulas which allow us to compare conical square functions with different cone apertures in weighted Lebesgue spaces. A key ingredient in our proofs is a generalization of the Carleson measure condition which is more natural when estimating the square functions below $p=2$.

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• Weighted Hardy spaces associated with elliptic operators. Part I: Weighted norm inequalities for conical square functions
• Weighted Hardy spaces associated with elliptic operators. Part II: Characterizations of $H_L^1(w)$
• Weighted Hardy spaces associated with elliptic operators. Part III: Characterizations of $H_L^p(w)$ and the weighted Hardy space associated with the Riesz transform

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• A PDE Characterization of Anisotropic Hardy Spaces
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