XMO and Weighted Compact Bilinear Commutators

Abstract

To study the compactness of bilinear commutators of certain bilinear Calderón--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.

28 pages; Submitted