Abstract
In this paper, we study the product BMO space, little bmo space, and their connections with the corresponding commutators associated with Bessel operators studied by Weinstein, Huber, and Muckenhoupt–Stein. We first prove that the product BMO space in the Bessel setting can be used to deduce the boundedness of the iterated commutators with the Bessel Riesz transforms. We next study the little \({\mathrm{bmo}}\) space in this Bessel setting and obtain the equivalent characterization of this space in terms of commutators, where the main tool that we develop is the characterization of the predual of little bmo and its weak factorizations. We further show that in analogy with the classical setting the little \({\mathrm{bmo}}\) space is a proper subspace of the product \({\mathrm{BMO}}\) space. These extend the previous related results studied by Cotlar–Sadosky and Ferguson–Sadosky on the bidisc to the Bessel setting, where the usual analyticity and Fourier transform do not apply.
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Acknowledgements
X. T. Duong and J. Li are supported by ARC DP 160100153. J. Li is also supported by Macquarie University New Staff Grant. B. D. Wick’s research is supported in part by National Science Foundation DMS Grants #1603246 and #1560955. D. Yang is supported by the NNSF of China (Grant No. 11571289). The authors would like to thank the referee for careful reading of the paper and for helpful comments and suggestions.
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Duong, X.T., Li, J., Ou, Y. et al. Product BMO, Little BMO, and Riesz Commutators in the Bessel Setting. J Geom Anal 28, 2558–2601 (2018). https://doi.org/10.1007/s12220-017-9920-2
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DOI: https://doi.org/10.1007/s12220-017-9920-2