Restriction theorems for orthonormal functions, Strichartz inequalities, and uniform Sobolev estimates
2017
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 Schr\"odinger 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 Schr\"odinger
operators with complex potentials, and to Schatten properties of the scattering matrix.
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