Abstract
Let (χ, ρ, μ) be a space of homogeneous type in the sense of Coifman and Weiss, and Y(χ) a ball quasi-Banach function space on χ, which supports both a Fefferman-Stein vector-valued maximal inequality and the boundedness of the powered Hardy-Littlewood maximal operator on its associate space. The authors first introduce the Hardy space HY(χ) associated with Y(χ), via the Lusin-area function, and then establish its various equivalent characterizations, respectively, in terms of atoms, molecules, and Littlewood—Paley g-functions and g *λ -functions. As an application, the authors obtain the boundedness of Calderón—Zygmund operators from HY (χ) to Y(χ), or to HY(χ) via first establishing a boundedness criterion of linear operators on HY(χ). All these results have a wide range of generality and, particularly, even when they are applied to variable Hardy spaces, the obtained results are also new. The major novelties of this article exist in that, to escape the reverse doubling condition of μ and the triangle inequality of ρ, the authors subtly use the wavelet reproducing formula, originally establish an admissible molecular characterization of HY(χ), and fully apply the geometrical properties of χ expressed by dyadic reference points or dyadic cubes.
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Acknowledgements
The authors would like to thank Fan Wang and Xing Fu for some helpful discussions on the subject of this article.
Funding
Supported by the National Key Research and Development Program of China (Grant No. 2020YFA0712900), the National Natural Science Foundation of China (Grant Nos. 11971058, 12071197 and 11871100) and the Fundamental Research Funds for the Central Universities (Grant Nos. 500421359 and 500421126)
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Yan, X.J., He, Z.Y., Yang, D.C. et al. Hardy Spaces Associated with Ball Quasi-Banach Function Spaces on Spaces of Homogeneous Type: Littlewood—Paley Characterizations with Applications to Boundedness of Calderón—Zygmund Operators. Acta. Math. Sin.-English Ser. 38, 1133–1184 (2022). https://doi.org/10.1007/s10114-022-1573-9
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DOI: https://doi.org/10.1007/s10114-022-1573-9
Keywords
- ball quasi-Banach function space
- Hardy space
- space of homogeneous type
- Littlewood—Paley function
- Calderón—Zygmund operator