This is an announcement for the paper "Operator Lipschitz functions on Banach spaces" by Jan Rozendaal, Fedor Sukochev and Anna Tomskova.

Abstract: Let $X$, $Y$ be Banach spaces and let $\mathcal{L}(X,Y)$ be the space of bounded linear operators from $X$ to $Y$. We develop the theory of double operator integrals on $\mathcal{L}(X,Y)$ and apply this theory to obtain commutator estimates of the form \begin{align*} |f(B)S-Sf(A)|_{\mathcal{L}(X,Y)}\leq \textrm{const} |BS-SA|_{\mathcal{L}(X,Y)} \end{align*} for a large class of functions $f$, where $A\in\mathcal{L}(X)$, $B\in \mathcal{L}(Y)$ are scalar type operators and $S\in \mathcal{L}(X,Y)$. In particular, we establish this estimate for $f(t):=|t|$ and for diagonalizable operators on $X=\ell_{p}$ and $Y=\ell_{q}$, for $p<q$ and $p=q=1$, and for $X=Y=\mathrm{c}_{0}$. We also obtain results for $p\geq q$. We study the estimate above in the setting of Banach ideals in $\mathcal{L}(X,Y)$. The commutator estimates we derive hold for diagonalizable matrices with a constant independent of the size of the matrix.

Archive classification: math.FA math.OA

Mathematics Subject Classification: Primary 47A55, 47A56, secondary 47B47

Remarks: 30 pages

Submitted from: janrozendaalmath@gmail.com

The paper may be downloaded from the archive by web browser from URL

http://front.math.ucdavis.edu/1501.03267

or

http://arXiv.org/abs/1501.03267