Restriction theorems for orthonormal functions, Strichartz inequalities, and uniform Sobolev estimates

Rupert L. Frank (1) , Julien Sabin (2)

1 Department of Mathematics (Caltech)
2 AGM - UMR 8088 - Analyse, Géométrie et Modélisation

We generalize the theorems of Stein--Tomas and Strichartz about surface restrictions of Fourier transforms to systems of orthonormal functions with an optimal dependence on the number of functions. We deduce the corresponding Strichartz bounds for solutions to Schrödinger equations up to the endpoint, thereby solving an open problem of Frank, Lewin, Lieb and Seiringer. We also prove uniform Sobolev estimates in Schatten spaces, extending the results of Kenig, Ruiz, and Sogge. We finally provide applications of these results to a Limiting Absorption Principle in Schatten spaces, to the well-posedness of the Hartree equation in Schatten spaces, to Lieb--Thirring bounds for eigenvalues of Schrödinger operators with complex potentials, and to Schatten properties of the scattering matrix.

Domaines: Physique mathématique [math-ph]; Equations aux dérivées partielles [math.AP]; Analyse fonctionnelle [math.FA]; Théorie spectrale [math.SP]

Rupert L. Frank, Julien Sabin. Restriction theorems for orthonormal functions, Strichartz inequalities, and uniform Sobolev estimates. American Journal of Mathematics, 2017, ⟨10.1353/ajm.2017.0041⟩. ⟨hal-00976541v3⟩