Radial Fourier multipliers in high dimensions

Abstract

Given a fixed $p\ne 2$, we prove a simple and effective characterization of all radial multipliers of $\cF L^p(\Bbb R^d)$, provided that the dimension $d$ is sufficiently large. The method also yields new $L^q$ space-time regularity results for solutions of the wave equation in high dimensions.

Some changes in the last section