Takaoka, Hideo2020-06-092020-06-092001-06-05Takaoka, H. (2001). Global well-posedness for Schrodinger equations with derivative in a nonlinear term and data in low-order Sobolev spaces. <i>Electronic Journal of Differential Equations, 2001</i>(42), pp. 1-23.1072-6691https://hdl.handle.net/10877/11554In this paper, we study the existence of global solutions to Schrodinger equations in one space dimension with a derivative in a nonlinear term. For the Cauchy problem we assume that the data belongs to a Sobolev space weaker than the finite energy space H1. Global existence for H1 data follows from the local existence and the use of a conserved quantity. For Hs data with s < 1, the main idea is to use a conservation law and a frequency decomposition of the Cauchy data then follow the method introduced by Bourgain [3]. Our proof relies on a generalization of the tri-linear estimates associated with the Fourier restriction norm method used in [1, 25].Text23 pages1 file (.pdf)enAttribution 4.0 InternationalNonlinear Schrodinger equationWell-posednessArticle