Separating Fourier and Schur multipliers

Cédric Arhancet, Christoph Kriegler, Christian Le Merdy +1

Let $G$ be a locally compact unimodular group, let $1\le p<\infty$,let $\varphi \in L^{\infty }(G)$ and assume that the Fourier multiplier $M_{\varphi }$associated with $\varphi$ is bounded on the noncomm…