geometric structure of nonlinearity and singularity of solutions for wave equations

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We studied the local and global well-posedness of the Cauchy problem for nonlinear dipersive equations and hyperbolic equations by the harmonic analysis. We improved the known results for a quadratic nonlinear Schrodinger equation and obtained the well-posedness result for low regularity data. The result is also applied to good Boussinesq equation. We showed the local well-posedness for nonlinear Dirac equation and Dirac-Klein-Gordon equation by using the property of null form. We also studied the Cauchy problem for the KdV equations with quasi periodic data.