The existence of light-like homogeneous geodesics in homogeneous Lorentzian manifolds

Details The existence of light-like homogeneous geodesics in homogeneous Lorentzian manifolds The existence of light-like homogeneous geodesics in homogeneous Lorentzian manifolds

2012-03-30

arxiv.org/abs/1203.6757v1

Mathematics

Differential Geometry

Scientific paper

In previous papers, a fundamental affine method for studying homogeneous geodesics was developed. Using this method and elementary differential topology it was proved that any homogeneous affine manifold and in particular any homogeneous pseudo-Riemannian manifold admits a homogeneous geodesic through arbitrary point. In the present paper this affine method is refined and adapted to the pseudo-Riemannian case. Using this method and elementary topology it is proved that any homogeneous Lorentzian manifold of even dimension admits a light-like homogeneous geodesic. The method is illustrated in detail with an example of the Lie group of dimension 3 with an invariant metric, which does not admit any light-like homogeneous geodesic.

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