Mathematics – Differential Geometry
Scientific paper
2011-11-25
Mathematics
Differential Geometry
Reason for withdrawal: A revised version of the paper is now part of arXiv:1112.5652v2
Scientific paper
We prove Wadsley's theorem for foliations by closed non-lightlike geodesics.
As an application we show that every pseudo-Riemannian and non-Riemannian
2-mainfold, all of whose time- or spacelike geodesics are closed, is
diffeomorphic to $S^1\times \R$. Further we show that every pseudo-Riemannian
2-manifold with index 1 contains a non-closed timelike or spacelike geodesic.
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