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Nonlinear Analysis Seminar and Differential Equation Seminar: Mihaela Ifrim, University of Wisconsin Madison, Global solutions for 1D cubic defocusing dispersive equations: Part I

April 5, 2023 | 3:00 pm - 4:00 pm EDT

This article is devoted to a general class of one dimensional NLS problems with a cubic nonlinearity. The question of obtaining scattering, global in time solutions for such problems has attracted a lot of attention in recent years, and many global well-posedness results have been proved for a number of models under the assumption that the initial data is both \emph{small} and \emph{localized}. However, except for the completelyintegrable case, no such results have been known for small but non-localized initial data. In this article we introduce a new, nonperturbative method, to prove global well-posedness and scattering for L2 initial data which is \emph{small} but \emph{non-localized}. Our main structural assumption is that our nonlinearity is \emph{defocusing}. However, we do not assume that our problem has any exact conservation laws. Our method is based on a robust reinterpretation of the idea of interaction Morawetz estimates, developed almost 20 years ago by the I-team.   In terms of scattering, we prove that our global solutions satisfy both global L6 Strichartz estimates and bilinear L2 bounds. This is a Galilean invariant result, which is new even for the classical defocusing cubic NLS. There, by scaling our result also admits a large data counterpart.


Zoom meeting: Link


April 5, 2023
3:00 pm - 4:00 pm EDT
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SAS 4201