Abstract
In this paper a pointwise sparse domination for generalized Hörmander and also for iterated commutators with those operators is provided generalizing the sparse domination result in Lerner et al. (Adv Math 319:153–181, 2017). Relying upon that sparse domination a number of quantitative estimates are derived. Some of them are improvements and complementary results to those contained in a series of papers due to Lorente et al. (Stud Math 195(2):157–192, 2009, J Math Anal Appl 342(2):1399–1425, 2008, J Fourier Anal Appl 11(5):497–509, 2005). Also the quantitative endpoint estimates in Lerner et al. (Adv Math 319:153–181, 2017) are extended to iterated commutators. Other results that are obtained in this work are some local exponential decay estimates for generalized Hörmander operators in the spirit of Ortiz-Caraballo et al. (Math Ann 357(4):1217–1243, 2013) and some negative results concerning Coifman–Fefferman estimates for a certain class of kernels satisfying particular generalized Hörmander conditions.
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Acknowledgements
The first author would like Carlos Pérez for inviting him to visit BCAM between January and April 2017, and BCAM for the warm hospitality shown during his visit.
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Communicated by Karlheinz Gröchenig.
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Gonzalo H. Ibáñez-Firnkorn: Supported by CONICET and SECYT-UNC and also by the Basque Government through the BERC 2014–2017 program and by Spanish Ministry of Economy and Competitiveness MINECO: BCAM Severo Ochoa excellence accreditation SEV-2013-0323. Israel P. Rivera-Ríos: Supported by the Basque Government through the BERC 2014–2017 program and by the Spanish Ministry of Economy and Competitiveness MINECO through BCAM Severo Ochoa excellence accreditation SEV-2013-0323 and also through the Projects MTM2014-53850-P and MTM2012-30748.
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Ibañez-Firnkorn, G.H., Rivera-Ríos, I.P. Sparse and weighted estimates for generalized Hörmander operators and commutators. Monatsh Math 191, 125–173 (2020). https://doi.org/10.1007/s00605-019-01349-8
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DOI: https://doi.org/10.1007/s00605-019-01349-8
Keywords
- Commutators
- Generalized Hörmander conditions
- Sparse operators
- Weighted inequalities
- Calderón–Zygmund operators