Abstract
Flat pseudo-Riemannian manifolds with a nilpotent transitive group of isometries are shown to be complete. Also flat pseudo-Riemannian homogeneous manifolds with non-trivial holonomy are shown to contain a complete geodesic.
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Duncan, D.C., Ihrig, E.C. Flat Pseudo-Reimannian manifolds with a nilpotent transitive group of isometries. Ann Glob Anal Geom 10, 87–101 (1992). https://doi.org/10.1007/BF00128341
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DOI: https://doi.org/10.1007/BF00128341