Darboux transforms and spectral curves of Hamiltonian stationary Lagrangian tori

Details Darboux transforms and spectral curves of Hamiltonian stationary Lagrangian tori Darboux transforms and spectral curves of Hamiltonian stationary Lagrangian tori

2008-06-11

arxiv.org/abs/0806.1848v1

Mathematics

Differential Geometry

30 pages, 13 figures

Scientific paper

The multiplier spectral curve of a conformal torus in the 4-sphere is essentially, see arXiv:0712.2311, given by all Darboux transforms of the conformal torus. In the particular case when the conformal immersion is a Hamiltonian stationary torus in Euclidean 4-space, the left normal of the immersion is harmonic, hence we can associate a second Riemann surface: the eigenline spectral curve of the left normal, as defined by Hitchin. We show that the multiplier spectral curve of a Hamiltonian stationary torus and the eigenline spectral curve of its left normal are biholomorphic Riemann surfaces of genus zero. Moreover, we prove that all Darboux transforms, which arise from generic points on the spectral curve, are Hamiltonian stationary whereas we also provide examples of Darboux transforms which are not even Lagrangian.

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