Totally null surfaces in neutral Kähler 4-manifolds

N. Georgiou, B. Guilfoyle, W. Klingenberg

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We study the totally null surfaces of the neutral Kähler metric on certain 4-manifolds. The tangent spaces of totally null surfaces are either self-dual (α-planes) or anti-self-dual (β-planes) and so we consider α-surfaces and β-surfaces. The metric of the examples we study, which include the spaces of oriented geodesics of 3-manifolds of constant curvature, are anti-self-dual, and so it is well-known that the α-planes are integrable and α-surfaces exist. These are holomorphic Lagrangian surfaces, which for the geodesic spaces correspond to totally umbilic foliations of the underlying 3-manifold. The β-surfaces are less known and our interest is mainly in their description. In particular, we classify the β-surfaces of the neutral Kähler metric on TN, the tangent bundle to a Riemannian 2-manifold N. These include the spaces of oriented geodesics in Euclidean and Lorentz 3-space, for which we show that the β-surfaces are affine tangent bundles to curves of constant geodesic curvature on S2 and H2, respectively. In addition, we construct the β-surfaces of the space of oriented geodesics of hyperbolic 3-space.

Original languageEnglish
Pages (from-to)27-41
Number of pages15
JournalBalkan Journal of Geometry and its Applications
Volume21
Issue number1
Publication statusPublished - 2016

Keywords

  • Neutral kaehler surface
  • Self-duality
  • α-planes
  • β-planes

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