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arXiv 2007.00284math.APmath.FA
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Littlewood-Paley-Stein泛函:R-有界性方法

Littlewood-Paley-Stein functionals: an R-boundedness approach

Thomas Cometx, El Maati Ouhabaz

摘要:

设$L = Δ+ V$是完备黎曼流形$M$上具有非负位势$V$的薛定谔算子.证明了与$L$相关的垂直Littlewood-Paley-Stein泛函在$L^p(M)$ { \it}上有界当且仅当}集合$\{\sqrt{t}\, \nabla e^{-tL}, \, t > 0\}$在$L^p(M)$上${\mathcal R}$ -有界.我们还介绍和研究了更一般的泛函。对于函数序列$m_k : [0, \infty) \to \mathbb{C}$,我们定义了$$H((f_k)) := \Big( \sum_k \int_0^\infty | \nabla m_k(tL) f_k |^2 dt \Big)^{1/2} + \Big( \sum_k \int_0^\infty | \sqrt{V} m_k(tL) f_k |^2 dt \Big)^{1/2}.$$.在对$M$相当合理的假设下,我们证明了$H$在$L^p(M)$上在$$\| H((f_k)) \|_p \le C\, \Big\| \Big( \sum_k |f_k|^2 \Big)^{1/2} \Big\|_p$$意义下的有界性,对于某些与$(f_k)_k$无关的常数$C$.在对偶空间$L^{p'}$上证明了一个较低的估计.我们引入并研究了其它Littlewood-Paley-Stein型泛函的有界性,并讨论了它们与Riesz变换的关系。文中给出了几个算例。

英文摘要:

Let $L = Δ+ V$ be a Schrödinger operator with a non-negative potential $V$ on a complete Riemannian manifold $M$. We prove that the vertical Littlewood-Paley-Stein functional associated with $L$ is bounded on $L^p(M)$ {\it if and only if} the set $\{\sqrt{t}\, \nabla e^{-tL}, \, t > 0\}$ is ${\mathcal R}$-bounded on $L^p(M)$. We also introduce and study more general functionals. For a sequence of functions $m_k : [0, \infty) \to \mathbb{C}$, we define $$H((f_k)) := \Big( \sum_k \int_0^\infty | \nabla m_k(tL) f_k |^2 dt \Big)^{1/2} + \Big( \sum_k \int_0^\infty | \sqrt{V} m_k(tL) f_k |^2 dt \Big)^{1/2}.$$ Under fairly reasonable assumptions on $M$ we prove boundedness of $H$ on $L^p(M)$ in the sense $$\| H((f_k)) \|_p \le C\, \Big\| \Big( \sum_k |f_k|^2 \Big)^{1/2} \Big\|_p$$ for some constant $C$ independent of $(f_k)_k$. A lower estimate is also proved on the dual space $L^{p'}$. We introduce and study boundedness of other Littlewood-Paley-Stein type functionals and discuss their relationships to the Riesz transform. Several examples are given in the paper.

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