Abstract
One defines a non-homogeneous space (X,μ) as a metric space equipped with a non-doubling measure μ so that the volume of the ball with center x, radius r has an upper bound of the form r n for some n>0. The aim of this paper is to study the boundedness of Calderón–Zygmund singular integral operators T on various function spaces on (X,μ) such as the Hardy spaces, the L p spaces, and the regularized BMO spaces. This article thus extends the work of X. Tolsa (Math. Ann. 319:89–149, 2011) on the non-homogeneous space (ℝn,μ) to the setting of a general non-homogeneous space (X,μ). Our framework of the non-homogeneous space (X,μ) is similar to that of Hytönen (2011) and we are able to obtain quite a few properties similar to those of Calderón–Zygmund operators on doubling spaces such as the weak type (1,1) estimate, boundedness from Hardy space into L 1, boundedness from L ∞ into the regularized BMO, and an interpolation theorem. Furthermore, we prove that the dual space of the Hardy space is the regularized BMO space, obtain a Calderón–Zygmund decomposition on the non-homogeneous space (X,μ), and use this decomposition to show the boundedness of the maximal operators in the form of a Cotlar inequality as well as the boundedness of commutators of Calderón–Zygmund operators and BMO functions.
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Communicated by Loukas Grafakos.
The Anh Bui was supported by a Macquarie University scholarship.
Xuan Thinh Duong was supported by research grants from Australian Research Council and Macquarie University.
This article is a slightly revised version of our paper arXiv:1009.1274v2. Later, the paper arXiv:1011.2937 of Hytönen et al. is an independent work and contains some results similar to ours in Sect. 6.3 by using a different approach.
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Bui, T.A., Duong, X.T. Hardy Spaces, Regularized BMO Spaces and the Boundedness of Calderón–Zygmund Operators on Non-homogeneous Spaces. J Geom Anal 23, 895–932 (2013). https://doi.org/10.1007/s12220-011-9268-y
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DOI: https://doi.org/10.1007/s12220-011-9268-y