Minimal-mass blowup solutions of the mass-critical NLS

Details Minimal-mass blowup solutions of the mass-critical NLS Minimal-mass blowup solutions of the mass-critical NLS

2006-09-25

arxiv.org/abs/math/0609690v2

Mathematics

Analysis of PDEs

Contains updated references and related remarks

Scientific paper

We consider the minimal mass $m_0$ required for solutions to the mass-critical nonlinear Schr\"odinger (NLS) equation $iu_t + \Delta u = \mu |u|^{4/d} u$ to blow up. If $m_0$ is finite, we show that there exists a minimal-mass solution blowing up (in the sense of an infinite spacetime norm) in both time directions, whose orbit in $L^2_x(\R^d)$ is compact after quotienting out by the symmetries of the equation. A similar result is obtained for spherically symmetric solutions. Similar results were previously obtained by Keraani, \cite{keraani}, in dimensions 1, 2 and Begout and Vargas, \cite{begout}, in dimensions $d\geq 3$ for the mass-critical NLS and by Kenig and Merle, \cite{merlekenig}, in the energy-critical case. In a subsequent paper we shall use this compactness result to establish global existence and scattering in $L^2_x(\R^d)$ for the defocusing NLS in three and higher dimensions with spherically symmetric data.

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