Mathematics – Differential Geometry
Scientific paper
2008-10-22
Mathematics
Differential Geometry
14 pages, 1 Figure AMSTEX
Scientific paper
We study the totally null surfaces of the neutral Kaehler metric on certain 4-manifolds. The tangent spaces of totally null surfaces are either self-dual ($\alpha$-planes) or anti-self-dual ($\beta$-planes) and so we consider $\alpha$-surfaces and $\beta$-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 $\alpha$-planes are integrable and $\alpha$-surfaces exist. These are holomorphic Lagrangian surfaces, which for the geodesic spaces correspond to totally umbilic foliations of the underlying 3-manifold. The $\beta$-surfaces are less known and our interest is mainly in their description. In particular, we classify the $\beta$-surfaces of the neutral Kaehler 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 $\beta$-surfaces are affine tangent bundles to curves of constant geodesic curvature on $S^2$ and $H^2$, respectively. In addition, we construct the $\beta$-surfaces of the space of oriented geodesics of hyperbolic 3-space.
Georgiou Nikos
Guilfoyle Brendan
Klingenberg Wilhelm
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