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Singular integrals in the rational Dunkl setting
Revista Matemática Complutense ( IF 1.4 ) Pub Date : 2021-07-28 , DOI: 10.1007/s13163-021-00402-1
Jacek Dziubański 1 , Agnieszka Hejna 1
Affiliation  

On \(\mathbb {R}^N\) equipped with a normalized root system R and a multiplicity function \(k\ge 0\) let us consider a (not necessarily radial) kernel \(K({\mathbf {x}})\) satisfying \(|\partial ^\beta K({\mathbf {x}})|\lesssim \Vert {\mathbf {x}}\Vert ^{-{\mathbf {N}}-|\beta |}\) for \(|\beta |\le s\), where \({\mathbf {N}}\) is the homogeneous dimension of the system \(({\mathbb {R}}^N,R,k)\). We additionally assume that

$$\begin{aligned} \sup _{0<a<b<\infty }\Big |\int _{a<\Vert {\mathbf {x}}\Vert<b} K({\mathbf {x}})\, dw({\mathbf {x}})\Big |<\infty , \end{aligned}$$

where dw is the associated measure. We prove that if s large enough then a singular integral Dunkl convolution operator associated with the kernel \(K({\mathbf {x}})\) is bounded on \(L^p(dw)\) for \(1<p<\infty \) and of weak-type (1,1). Furthermore, we study a maximal function related to the Dunkl convolutions with truncation of K.



中文翻译:

有理 Dunkl 设置中的奇异积分

\(\mathbb {R}^N\)配备归一化根系统R和多重函数\(k\ge 0\)让我们考虑一个(不一定是径向的)核\(K({\mathbf {x }})\)满足\(|\partial ^\beta K({\mathbf {x}})|\lesssim \Vert {\mathbf {x}}\Vert ^{-{\mathbf {N}}-| \beta |}\)\(|\beta |\le s\),其中\({\mathbf {N}}\)是系统的齐次维度\(({\mathbb {R}}^N ,R,k)\)。我们另外假设

$$\begin{aligned} \sup _{0<a<b<\infty }\Big |\int _{a<\Vert {\mathbf {x}}\Vert<b} K({\mathbf {x }})\, dw({\mathbf {x}})\Big |<\infty , \end{aligned}$$

其中dw是相关度量。我们证明,如果s足够大,那么与内核\(K({\mathbf {x}})\)相关的奇异积分 Dunkl 卷积算子在\(L^p(dw)\)上有界,对于\(1< p<\infty \)和弱类型 (1,1)。此外,我们研究了与截断K的 Dunkl 卷积相关的最大函数。

更新日期:2021-07-28
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