Vol. 13, No. 7, 2020

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Refined mass-critical Strichartz estimates for Schrödinger operators

Casey Jao

Vol. 13 (2020), No. 7, 1955–1994

We develop refined Strichartz estimates at L2 regularity for a class of time-dependent Schrödinger operators. Such refinements quantify near-optimizers of the Strichartz estimate and play a pivotal part in the global theory of mass-critical NLS. On one hand, the harmonic analysis is quite subtle in the L2-critical setting due to an enormous group of symmetries, while on the other hand, the space-time Fourier analysis employed by the existing approaches to the constant-coefficient equation are not adapted to nontranslation-invariant situations, especially with potentials as large as those considered in this article.

Using phase-space techniques, we reduce to proving certain analogues of (adjoint) bilinear Fourier restriction estimates. Then we extend Tao’s bilinear restriction estimate for paraboloids to more general Schrödinger operators. As a particular application, the resulting inverse Strichartz theorem and profile decompositions constitute a key harmonic analysis input for studying large-data solutions to the L2-critical NLS with a harmonic oscillator potential in dimensions 2. This article builds on recent work of Killip, Visan, and the author in one space dimension.

inverse Strichartz estimates, bilinear restriction, Schrödinger operators
Mathematical Subject Classification 2010
Primary: 35Q41
Secondary: 42B37
Received: 30 October 2017
Revised: 29 July 2018
Accepted: 6 September 2019
Published: 10 November 2020
Casey Jao
Department of Mathematics
University of Toronto
Toronto, ON