Nonlinear wave equation, nonlinear Riemann problem, and the twistor transform of Veronese webs

Details Nonlinear wave equation, nonlinear Riemann problem, and the twistor transform of Veronese webs Nonlinear wave equation, nonlinear Riemann problem, and the twistor transform of Veronese webs

2000-06-04

arxiv.org/abs/math-ph/0006001v1

Physics

Mathematical Physics

43 pages, preliminary version

Scientific paper

Veronese webs are rich geometric structures with deep relationships to various domains of mathematics. The PDEs which determine the Veronese web are overdetermined if dim >3, but in the case dim =3 they reduce to a special flavor of a non-linear wave equation. The symmetries embedded in the definition of a Veronese web reveal themselves as B\"acklund--Darboux transformations between these non-linear wave equations. On the other hand, the twistor transform identifies Veronese webs with moduli spaces of rational curves on certain complex surfaces. These moduli spaces can be described in terms of the non-linear Riemann problem. This reduces solutions of these non-linear wave equations to the non-linear Riemann problem. We examine these relationships in the particular case of 3-dimensional Veronese webs, simultaneously investigating how these notions relate to general notions of geometry of webs.

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