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

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

2001-10-03

arxiv.org/abs/math/0110045v2

Mathematics

Analysis of PDEs

submitted to JAMS

Scientific paper

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.

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