Abstract
We introduce a randomization of a function on \( \mathbb{R}^{d} \) that is naturally associated to the Wiener decomposition and, intrinsically, to the modulation spaces. Such randomized functions enjoy better integrability, thus allowing us to improve the Strichartz estimates for the Schrödinger equation. As an example, we also show that the energy-critical cubic nonlinear Schrödinger equation on \( \mathbb{R}^{4} \) is almost surely locally well posed with respect to randomized initial data below the energy space.
This work is partially supported by a grant from the Simons Foundation (No. 246024 to Árpád Bényi).
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Notes
- 1.
For NLW, one needs to specify \( (u,\partial _{t}u)\vert _{t=0} \) as an initial condition. For simplicity of presentation, we only displayed u | t = 0in (3).
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Bényi, Á., Oh, T., Pocovnicu, O. (2015). Wiener randomization on unbounded domains and an application to almost sure well-posedness of NLS. In: Balan, R., Begué, M., Benedetto, J., Czaja, W., Okoudjou, K. (eds) Excursions in Harmonic Analysis, Volume 4. Applied and Numerical Harmonic Analysis. Birkhäuser, Cham. https://doi.org/10.1007/978-3-319-20188-7_1
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