Retraction Note: Minimally thin sets associated with the stationary Schrödinger operator

This article has been retracted. Please see the Retraction Notice for more detail: 10.1186/s13660-021-02575-1

Introduction

This chapter discusses the Fourier restriction. The Fourier restriction problem presents one important instance of a wide circle of related problems, such as the boundedness properties of Bochner Riesz means, dimensional properties of Kakeya type sets, smoothing effects of averaging over time intervals for solutions to the wave equation (or more general dispersive equations), or the study of maximal averages along hypersurfaces. The common question underlying all these problems asks for the understanding of the interplay between the Fourier transform and properties of thin sets in Euclidean space, for instance geometric properties of subvarieties. The chapter builds on previous discussions on Fourier restrictions, and presents a brief overview of the succeeding chapters.