Conformal holonomy of C-spaces, Ricci-flat, and Lorentzian manifolds

Details Conformal holonomy of C-spaces, Ricci-flat, and Lorentzian manifolds Conformal holonomy of C-spaces, Ricci-flat, and Lorentzian manifolds

2005-01-15

arxiv.org/abs/math/0501239v3

Mathematics

Differential Geometry

28 pages, revised versions: typos corrected, references added

Scientific paper

The main result of this paper is that a Lorentzian manifold is locally conformally equivalent to a manifold with recurrent lightlike vector field and totally isotropic Ricci tensor if and only if its conformal tractor holonomy admits a 2-dimensional totally isotropic invariant subspace. Furthermore, for semi-Riemannian manifolds of arbitrary signature we prove that the conformal holonomy algebra of a $C$-space is a Berger algebra. For Ricci-flat spaces we show how the conformal holonomy can be obtained by the holonomy of the ambient metric and get results for Riemannian manifolds and plane waves.

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