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math.DG2014
Affine transformations and parallel lightlike vector fields on compact Lorentzian -manifolds
Charles Boubel, Pierre Mounoud
We describe the compact Lorentzian -manifolds admitting a parallel lightlike vector field. The classification of compact Lorentzian -manifolds admitting non-isometric affine…
math.DG2014★ 1 cited
The algebra of the parallel endomorphisms of a pseudo-Riemannian metric: semi-simple part
Charles Boubel
On a (pseudo-)Riemannian manifold (MM,g), some fields of endomorphisms i.e. sections of End(TMM) may be parallel for g. They form an associative algebra A, which is also the commut…