Riesz transforms and commutators in the Dunkl setting
Analysis and Mathematical Physics(2024)
Abstract
In this paper we characterise the pointwise size and regularity estimates for the Dunkl Riesz transform kernel involving both the Euclidean metric and the Dunkl metric, where these two metrics are not equivalent. We further establish a suitable version of the pointwise kernel lower bound of the Dunkl Riesz transform via the Euclidean metric only. Then we show that the lower bound of commutator of the Dunkl Riesz transform is with respect to the BMO space associated with the Euclidean metric, and that the upper bound is respect to the BMO space associated with the Dunkl metric. Moreover, the compactness and the two types of VMO are also addressed.
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Key words
Dunkl Riesz transform,Commutator,BMO,VMO,Primary 42B35,Secondary 43A85,42B25,42B30
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