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Paul Alphonse, Nikolay Tzvetkov, A Smoothing Effect for the Fractional Schrödinger Equations on the Circle and Observability, International Mathematics Research Notices, Volume 2025, Issue 8, April 2025, rnaf100, https://doi.org/10.1093/imrn/rnaf100
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Abstract
We show that, after a renormalization, one can define the square of the modulus of the solution of the fractional Schrödinger equations on the circle with data in Sobolev spaces of arbitrary negative index. As an application, we obtain observability estimates with rough controls.
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