Infinitesimal Darboux transformations of the spectral curves of tori in the four-space

Details Infinitesimal Darboux transformations of the spectral curves of tori in the four-space Infinitesimal Darboux transformations of the spectral curves of tori in the four-space

2006-11-08

arxiv.org/abs/math/0611215v1

International Mathematics Research Notices 2007 (2007), rnm005, 1-21

Mathematics

Differential Geometry

18 pages

Scientific paper

We study the action of conformal transformations of the ambient space on the Dirac operator coming into the Weierstrass (or spinor) representation of a torus in the Euclidean four-space. It is showed that such an action generates a flow acting on the potential of the operator, that this flow is described by a nonlinear system of the Melnikov type and that it preserves the Floquet multipliers of the Dirac operator with double-periodic potential. However this flow is only almost isospectral since it does not preserve the spectral curve in general and its action may result in adding or removing multiple points corresponding to the same multipliers. We demonstrate that in some important geometrical examples after reparameterization of the temporary variable such flows are governed by integrable systems on whiskered tori.

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