On Schrödinger maps

Details On Schrödinger maps On Schrödinger maps

2001-04-11

arxiv.org/abs/math/0104125v2

Mathematics

Analysis of PDEs

Scientific paper

We study the question of well-posedness of the Cauchy problem for Schr\"odinger maps from $\rone \times \rtwo$ to the sphere $\stwo$ or to ${\mathbb H^2}$, the hyperbolic space. The idea is to choose an appropriate gauge change so that the derivatives of the map will satisfy a certain nonlinear Schr\"odinger system of equations and then study this modified Schr\"odinger map system (MSM). We then prove local well posedness of the Cauchy problem for the MSM with minimal regularity assumptions on the data and outline a method to derive well posedness of the Schr\"odinger map itself from it. In proving well posedness of the MSM, the heart of the matter is resolved by considering truly quatrilinear forms of weighted $L^2$ functions.

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