Multilinear spherical maximal function

Abstract

In dimensions n ≥ 2 n\ge 2 we obtain L p 1 ( R n ) × ⋯ × L p m ( R n ) L^{p_1}(\mathbb R^n) \times \dots \times L^{p_m}(\mathbb R^n) to L p ( R n ) L^p(\mathbb R^n) boundedness for the multilinear spherical maximal function in the largest possible open set of indices and we provide counterexamples that indicate the optimality of our results. Moreover, we obtain weak type and Lorentz space estimates as well as counterexamples in the endpoint cases.