Sharp Global well-posedness for KdV and modified KdV on $\R$ and $\T$

By James E. Colliander, M. Keel, Gigliola Staffilani, Hideo Takaoka, T. Tao. 2001

51 citations recorded by the source corpus.

The initial value problems for the Korteweg-de Vries (KdV) and modified KdV (mKdV) equations under periodic and decaying boundary conditions are considered. These initial value problems are shown to be globally well-posed in all $L^2$-based Sobolev spaces $H^s$ where local well-posedness is presently known, apart from the $H^{{1/4}} (\R)$ endpoint for mKdV. The result for KdV relies on a new method for constructing almost conserved quantities using multilinear harmonic analysis and the available local-in-time theory. Miura's transformation is used to show that global well-posedness of modified KdV is implied by global well-posedness of the standard KdV equation.

Subfields: Mathematical Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/e96931ea948c59dc6c41d858fb0718ffef4a7bb4