On the multilinear restriction and Kakeya conjectures

Abstract

We prove d-linear analogues of the classical restriction and Kakeya conjectures in R^d. Our approach involves obtaining monotonicity formulae pertaining to a certain evolution of families of gaussians, closely related to heat flow. We conclude by giving some applications to the corresponding variable-coefficient problems and the so-called “joints” problem, as well as presenting some n-linear analogues for n < d.