The Kerman-Sawyer trace theorem for product Morrey spaces

Abstract

By using parallel corona decomposition, the Kerman-Sawyer trace theorem is extended from Lebesgue spaces to \textit{product Morrey spaces}. By discretizing the multilinear fractional integral operator based on dyadic analysis, the framework of \textit{product Morrey spaces} naturally arises in the course of estimating the operator. Within this natural setting, by establishing Sawyer-type testing estimates (to the setting of measures), we obtain an extension of the Kerman-Sawyer trace theorem. The classical approach to the Kerman-Sawyer trace theorem typically relies on a reduction to Carleson's embedding theorem. In contrast, in this paper we employ a parallel corona decomposition, which allows us to overcome the difficulties inherent in the multilinear setting and to provide a transparent and streamlined proof. By incorporating recent developments in the theory of weights, this work clarifies the relationship between trace inequalities and Morrey spaces and contributes to a deeper understanding of these topics.