On the role of quadratic oscillations in nonlinear Schroedinger equations II. The $L^2$-critical case

Details On the role of quadratic oscillations in nonlinear Schroedinger equations II. The $L^2$-critical case On the role of quadratic oscillations in nonlinear Schroedinger equations II. The $L^2$-critical case

2004-04-09

arxiv.org/abs/math/0404201v2

Trans. Amer. Math. Soc. 359 (2007), 33-62.

Mathematics

Analysis of PDEs

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Scientific paper

We consider a nonlinear semi-classical Schroedinger equation for which quadratic oscillations lead to focusing at one point, described by a nonlinear scattering operator. The relevance of the nonlinearity was discussed by R. Carles, C. Fermanian-Kammerer and I. Gallagher for $L^2$-supercritical power-like nonlinearities and more general initial data. The present results concern the $L^2$-critical case, in space dimensions 1 and 2; we describe the set of non-linearizable data, which is larger, due to the scaling. As an application, we precise a result by F. Merle and L. Vega concerning finite time blow up for the critical Schroedinger equation. The proof relies on linear and nonlinear profile decompositions.

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