On the Full Holonomy of Lorentzian Manifolds with Parallel Weyl Tensor

Details On the Full Holonomy of Lorentzian Manifolds with Parallel Weyl Tensor On the Full Holonomy of Lorentzian Manifolds with Parallel Weyl Tensor

2012-04-26

arxiv.org/abs/1204.5907v1

Mathematics

Differential Geometry

13 pages

Scientific paper

We compute the full holonomy group of compact Lorentzian manifolds with parallel Weyl tensor, which are neither conformally flat nor locally symmetric, for the case where the fundamental group is contained in a distinguished subgroup G of the isometry group of the universal cover. To prove this, we show that every such compact Lorentzian manifold has to be geodesically complete. Moreover we characterize the identity component of the isometry group for this universal cover and show that G is up to a discrete factor contained in the latter. Concretely, we prove that the identity component of the isometry group is isomorphic to a semidirect product of a subgroup of SO(n) with the Heisenberg group.

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