Explicit construction of harmonic two-spheres into the complex Grassmannian

Details Explicit construction of harmonic two-spheres into the complex Grassmannian Explicit construction of harmonic two-spheres into the complex Grassmannian

2010-07-23

arxiv.org/abs/1007.4143v1

Mathematics

Differential Geometry

Scientific paper

We present an explicit description of all harmonic maps of finite uniton number from a Riemann surface into a complex Grassmannian. Namely, starting from a constant map $Q$ and a collection of meromorphic functions and their derivatives, we show how to algebraically construct all harmonic maps from the two-sphere into a given Grassmannian $G_p(\mathbb C^n)$. In this setting the uniton number depends on $Q$ and $p$ and we obtain a sharp estimate for it.

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