Mathematics – Differential Geometry
Scientific paper
1997-08-08
Mathematics
Differential Geometry
65 pages, no figures, AMSTeX. To appear in October 1997 Bulletin of AMS, email palais@math.brandeis.edu
Scientific paper
This paper is an expository account of the development of soliton mathematics, from its inception in famous numerical experiments of Fermi-Pasta-Ulam and Zabusky-Kruskal to the recent synthesis of Terng-Uhlenbeck (dg-ga/9707004) that explains hidden symmetries of soliton equations in terms of loop-groups acting by dressing transformations. The inverse scattering method is explained in detail, first using inverse scattering for the Schroedinger equation to solve the IVP for the KdV equation (the original application) and then using inverse scattering for the Zero Curvature Lax Equation to solve the IVP for the Nonlinear Schroedinger equation, and more generally other integrable PDE arising from the ZS-AKNS scheme devised by Zakharov and Shabat and by Ablowitz, Kaup, Newell and Segur. The paper is a revised version of notes from a series of Rudolf Lipschitz Lectures delivered by the author at Bonn University in January and February of 1997.
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