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hal-00647338, version 1

## Square functions for Ritt operators on noncommutative $L^p$-spaces

Cédric Arhancet 1

(2011-09-08)

Abstract: For any Ritt operator $T$ acting on a noncommutative $L^p$-space, we define the notion of \textit{completely} bounded functional calculus $H^\infty(B_\gamma)$ where $B_\gamma$ is a Stolz domain. Moreover, we introduce the 'column square functions' $\norm{x}_{T,c,\alpha}=\Bnorm{\Big(\sum_{k=1}^{+\infty}k^{2\alpha-1}|T^{k-1}(I-T)^{\alpha}(x)|^2\Big)^{1/2}}_{L^p(M)}$ and the 'row square functions' $\norm{x}_{T,r,\alpha}=\Bnorm{\Big(\sum_{k=1}^{+\infty}k^{2\alpha-1} |\Big(T^{k-1}(I-T)^{\alpha}(x)\Big)^*|^2\Big)^{1/2}}_{L^p(M)}$ for any $\alpha>0$ and any $x\in L^p(M)$. Then, we provide an example of Ritt operator which admits a completely bounded $H^\infty(B_\gamma)$ functional calculus for some $\gamma \in \big]0,\frac{\pi}{2}\big[$ such that the square functions $\norm{\cdot}_{T,c,\alpha}$ (or $\norm{\cdot}_{T,r,\alpha}$) are not equivalent to the usual norm $\norm{\cdot}_{L^p(M)}$. Moreover, assuming $10$, we prove that if $\Ran (I-T)$ is dense and $T$ admits a completely bounded $H^\infty(B_\gamma)$ functional calculus for some $\gamma \in \big]0,\frac{\pi}{2}\big[$ then there exists a positive constant $C$ such that for any $x \in L^p(M)$, there exists $x_1, x_2 \in L^p(M)$ satisfying $x=x_1+x_2$ and $\norm{x_1}_{T,c,\alpha}+\norm{x_2}_{T,r,\alpha}\leq C \norm{x}_{L^p(M)}$. Finally, we observe that this result applies to a suitable class of selfadjoint Markov maps on noncommutative $L^p$-spaces.

• 1:  Laboratoire de Mathématiques (LM-Besançon)
• CNRS : UMR6623 – Université de Franche-Comté
• Domain : Mathematics/Operator Algebras
Mathematics/Functional Analysis

• hal-00647338, version 1
• oai:hal.archives-ouvertes.fr:hal-00647338
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• Submitted on: Thursday, 1 December 2011 18:21:34
• Updated on: Thursday, 1 December 2011 18:21:34