Area minimizers in a K3 surface and holomorphicity

Details Area minimizers in a K3 surface and holomorphicity Area minimizers in a K3 surface and holomorphicity

2005-05-20

arxiv.org/abs/math/0505440v1

Mathematics

Differential Geometry

Scientific paper

A well known consequence of the Wirtinger inequality is that in a Kaehler surface a holomorphic curve is an area minimizer in its homology class. In light of this result it is natural, given a Kaehler surface, to investigate the relation between area minimizers and complex curves. When the Kaehler surface is a K3 surface this problem takes on a new character. A Ricci flat (Calabi-Yau) metric on a K3 surface X is hyperkaehler in the sense that there is a two-sphere of complex structures, called the hyperkaehler line, each of which is compatible with the metric. A minimizer of area among surfaces representing a homology class \alpha consists of a sum of branched immersed surfaces and it is then reasonable to ask whether each surface in this collection is holomorphic for some complex structure on the hyperkaehler line. Though this is true for many homology classes and there is other evidence that makes this pausible, in this paper we show that there is an integral homology class \alpha and a hyperkaehler metric g such that no area minimizer of \alpha has this property.

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