Nonlinear Beltrami equation and tau-function for dispersionless hierarchies

Details Nonlinear Beltrami equation and tau-function for dispersionless hierarchies Nonlinear Beltrami equation and tau-function for dispersionless hierarchies

2003-10-27

arxiv.org/abs/nlin/0310038v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

12 pages

Scientific paper

10.1016/j.physleta.2004.01.033

It is proved that the action for nonlinear Beltrami equation (quasiclassical dbar-problem) evaluated on its solution gives a tau-function for dispersionless KP hierarchy. Infinitesimal transformations of tau-function corresponding to variations of dbar-data are found. Determinant equations for the function generating these transformations are derived. They represent a dispersionless analogue of singular manifold (Schwarzian) KP equations. Dispersionless 2DTL hierarchy is also considered.

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