交换元组的弱类型算子Lipschitz和交换子估计

M. Caspers, F. Sukochev, D. Zanin
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引用次数: 5

摘要

设$f: \mathbb{R}^d \to\mathbb{R}$是一个Lipschitz函数。如果$B$是有界自共轭算子,如果$\{A_k\}_{k=1}^d$是可交换有界自共轭算子,使得$[A_k,B]\in L_1(H),$,则$$\|[f(A_1,\cdots,A_d),B]\|_{1,\infty}\leq c(d)\|\nabla(f)\|_{\infty}\max_{1\leq k\leq d}\|[A_k,B]\|_1,$$(其中$c(d)$是独立于$f$、$\mathcal{M}$、$A,B$和$\|\cdot\|_{1,\infty}$为弱$L_1$范数)。如果$\{X_k\}_{k=1}^d$(分别为$\{Y_k\}_{k=1}^d$)是可交换有界自伴随算子,使得$X_k-Y_k\in L_1(H),$则 $$\|f(X_1,\cdots,X_d)-f(Y_1,\cdots,Y_d)\|_{1,\infty}\leq c(d)\|\nabla(f)\|_{\infty}\max_{1\leq k\leq d}\|X_k-Y_k\|_1.$$
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Weak type operator Lipschitz and commutator estimates for commuting tuples
Let $f: \mathbb{R}^d \to\mathbb{R}$ be a Lipschitz function. If $B$ is a bounded self-adjoint operator and if $\{A_k\}_{k=1}^d$ are commuting bounded self-adjoint operators such that $[A_k,B]\in L_1(H),$ then $$\|[f(A_1,\cdots,A_d),B]\|_{1,\infty}\leq c(d)\|\nabla(f)\|_{\infty}\max_{1\leq k\leq d}\|[A_k,B]\|_1,$$ where $c(d)$ is a constant independent of $f$, $\mathcal{M}$ and $A,B$ and $\|\cdot\|_{1,\infty}$ denotes the weak $L_1$-norm. If $\{X_k\}_{k=1}^d$ (respectively, $\{Y_k\}_{k=1}^d$) are commuting bounded self-adjoint operators such that $X_k-Y_k\in L_1(H),$ then $$\|f(X_1,\cdots,X_d)-f(Y_1,\cdots,Y_d)\|_{1,\infty}\leq c(d)\|\nabla(f)\|_{\infty}\max_{1\leq k\leq d}\|X_k-Y_k\|_1.$$
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