Twistor geometry and warped product orthogonal complex structures

TL;DR

This paper investigates orthogonal complex structures on Euclidean spaces using twistor geometry, proving that finite energy structures in R^6 are warped products and that asymptotically constant structures are globally constant, with various examples provided.

Contribution

It establishes a classification of finite energy orthogonal complex structures on R^6 and asymptotically constant structures on R^{2n}, using twistor geometric methods.

Findings

Finite energy orthogonal complex structures on R^6 are warped products.

Asymptotically constant orthogonal complex structures on R^{2n} are globally constant.

Examples of infinite energy structures and non-standard structures on flat tori are provided.

Abstract

The twistor space of the sphere S^{2n} is an isotropic Grassmannian that fibers over S^{2n}. An orthogonal complex structure on a subdomain of S^{2n} (a complex structure compatible with the round metric) determines a section of this fibration with holomorphic image. In this paper, we use this correspondence to prove that any finite energy orthogonal complex structure on R^6 must be of a special warped product form, and we also prove that any orthogonal complex structure on R^{2n} that is asymptotically constant must itself be constant. We will also give examples defined on R^{2n} which have infinite energy, and examples of non-standard orthogonal complex structures on flat tori in complex dimension three and greater.