XMO and Weighted Compact Bilinear Commutators

TL;DR

This paper characterizes the space XMO(R^n) related to bilinear Calderón–Zygmund operators, showing it is a proper subset of VMO(R^n), and applies this to establish weighted compactness of bilinear commutators.

Contribution

It provides a negative answer to the conjecture that XMO(R^n) equals VMO(R^n), offering an equivalent characterization and new techniques involving dyadic cubes.

Findings

XMO(R^n) is a proper subspace of VMO(R^n).

Established an equivalent characterization of XMO(R^n).

Obtained a weighted compactness result for bilinear commutators.

Abstract

To study the compactness of bilinear commutators of certain bilinear Calder\'on--Zygmund operators which include (inhomogeneous) Coifman--Meyer bilinear Fourier multipliers and bilinear pseudodifferential operators as special examples, Torres and Xue [Rev. Mat. Iberoam. 36 (2020), 939--956] introduced a new subspace of BMO$\,(\mathbb{R}^n)$, denoted by XMO$\,(\mathbb{R}^n)$, and conjectured that it is just the space VMO$\,(\mathbb{R}^n)$ introduced by D. Sarason. In this article, the authors give a negative answer to this conjecture by establishing an equivalent characterization of XMO$\,(\mathbb{R}^n)$, which further clarifies that XMO$\,(\mathbb{R}^n)$ is a proper subspace of VMO$\,(\mathbb{R}^n)$. This equivalent characterization of XMO$\,(\mathbb{R}^n)$ is formally similar to the corresponding one of CMO$\,(\mathbb{R}^n)$ obtained by A. Uchiyama, but its proof needs some essential new techniques on dyadic cubes as well as some exquisite geometrical observations. As an application, the authors also obtain a weighted compactness result on such bilinear commutators, which optimizes the corresponding result in the unweighted setting.