Mathematical Research Letters

Volume 25 (2018)

Number 3

Higher decay inequalities for multilinear oscillatory integrals

Pages: 819 – 842



Maxim Gilula (Department of Mathematics, Michigan State University, East Lansing, Mi., U.S.A.)

Philip T. Gressman (Department of Mathematics, University of Pennsylvania, Philadelphia, Pa., U.S.A.)

Lechao Xiao (Department of Mathematics, University of Pennsylvania, Philadelphia, Pa., U.S.A.)


In this paper we establish sharp estimates (up to logarithmic losses) for the multilinear oscillatory integral operator studied by Phong, Stein, and Sturm, and byCarbery and Wright on any product $\prod^d_{j=1} L^{p_j} (\mathbb{R})$ with each $p_j \geq 2$, extending the known results outside the previously-studied range $\sum^d_{j=1} p^{-1}_j = d-1$. Our theorem assumes a second-order nondegeneracy condition of Varčenko type, and as a corollary reproduces a variant of Varčenko’s theorem and implies Fourier decay estimates for measures of smooth density on degenerate hypersurfaces in $\mathbb{R}^d$.


Newton polyhedron, multilinear oscillatory integral forms

2010 Mathematics Subject Classification


The second author is partially supported by NSF grant DMS-1361697 and an Alfred P. Sloan Research Fellowship.

Received 9 December 2016

Accepted 2 December 2017

Published 3 August 2018