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Totally null surfaces in neutral Kähler 4-manifolds.

Georgiou, N. and Guilfoyle, B. and Klingenberg, W. (2016) 'Totally null surfaces in neutral Kähler 4-manifolds.', Balkan journal of geometry and its applications., 21 (1). pp. 27-41.


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.

Item Type:Article
Full text:Publisher-imposed embargo
(VoR) Version of Record
File format - PDF
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Date accepted:02 May 2016
Date deposited:06 September 2016
Date of first online publication:24 August 2016
Date first made open access:No date available

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