Inverse Scattering at a Fixed Quasi-Energy for Potentials Periodic in Time

Abstract

We prove that the scattering matrix at a fixed quasi--energy determines uniquely a time--periodic potential that decays exponentially at infinity. We consider potentials that for each fixed time belong to $L^{3/2}$ in space. The exponent 3/2 is critical for the singularities of the potential in space. For this singular class of potentials the result is new even in the time--independent case, where it was only known for bounded exponentially decreasing potentials.

In this revised version I give a more detailed motivation of the class of potentials that I consider and I have corrected some typos

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