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arXiv 1802.06607math.FA
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有理Dunkl背景下的调和函数、共轭调和函数与Hardy空间$H^1$

Harmonic functions, conjugate harmonic functions and the Hardy space $H^1$ in the rational Dunkl setting

Jean-Philippe Anker, Jacek Dziubański, Agnieszka Hejna

摘要:

在这项工作中,我们扩展了经典的Hardy空间$H^1$的理论,合理的Dunkl设置。具体地说,令$Δ$是欧几里得空间$\mathbb{R}^N$上的Dunkl Laplacian。在半空间$\mathbb{R}_+\times\mathbb{R}^N$上,我们考虑共轭$(\partial_t^2+Δ_{\mathbf{x}})$ -调和函数系统满足适当的一致$L^1$条件.证明了构成实Hardy空间$H^1$的这种调和函数的边值可以用原子、Riesz变换、极大函数或Littlewood-Paley平方函数等不同方法刻画.

英文摘要:

In this work we extend the theory of the classical Hardy space $H^1$ to the rational Dunkl setting. Specifically, let $Δ$ be the Dunkl Laplacian on a Euclidean space $\mathbb{R}^N$. On the half-space $\mathbb{R}_+\times\mathbb{R}^N$, we consider systems of conjugate $(\partial_t^2+Δ_{\mathbf{x}})$-harmonic functions satisfying an appropriate uniform $L^1$ condition. We prove that the boundary values of such harmonic functions, which constitute the real Hardy space $H^1$, can be characterized in several different ways, namely by means of atoms, Riesz transforms, maximal functions or Littlewood-Paley square functions.

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