Einstein Metrics, Spinning Top Motions and Monopoles.
Einstein-Weyl structures on lightlike hypersurfaces
We study Weyl structures on lightlike hypersurfaces endowed with a conformal structure of certain type and specific screen distribution: the Weyl screen structures. We investigate various differential geometric properties of Einstein-Weyl screen structures on lightlike hypersurfaces and show that, for ambient Lorentzian space ℝ1n+2 and a totally umbilical screen foliation, there is a strong interplay with the induced (Riemannian) Weyl-structure on the leaves.
Entire Spacelike Hypersurfaces on Constant Mean Curvature in Minkowski Space.
Errata d'articles antérieurs
Erratum to “On the geodesic connectedness of simply connected Lorentz surfaces”
Espaces-temps asymptotiquement plats invariants par un groupe de transformations asymptotiques isomorphe au groupe de Bondi-Metzner
Espaces-temps possédant la propriété de Killing
Examples of sectional curvature with prescribed symmetry on -manifolds