Conformal maps from a 2-torus to the 4-sphere

Details Conformal maps from a 2-torus to the 4-sphere Conformal maps from a 2-torus to the 4-sphere

2007-12-14

arxiv.org/abs/0712.2311v1

Mathematics

Differential Geometry

27 pages, 5 figures

Scientific paper

We study the space of conformal immersions of a 2-torus into the 4-sphere. The moduli space of generalized Darboux transforms of such an immersed torus has the structure of a Riemann surface, the spectral curve. This Riemann surface arises as the zero locus of the determinant of a holomorphic family of Dirac type operators parameterized over the complexified dual torus. The kernel line bundle of this family over the spectral curve describes the generalized Darboux transforms of the conformally immersed torus. If the spectral curve has finite genus the kernel bundle can be extended to the compactification of the spectral curve and we obtain a linear 2-torus worth of algebraic curves in projective 3-space. The original conformal immersion of the 2-torus is recovered as the orbit under this family of the point at infinity on the spectral curve projected to the 4-sphere via the twistor fibration.

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