Global well-posedness for 2D radial Schrödinger maps into the sphere

We prove global well-posedness for a cubic, non-local Schrödinger equation with radially-symmetric initial data in the critical space $L^2(\R^2)$, using the framework of Kenig-Merle and Killip-Tao-Visan. As a consequence, we obtain a global well-posedness result for Schrödinger maps from $\R^2$ into $§^2$ (Landau-Lifshitz equation) with radially symmetric initial data (with no size restriction).

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