Orateur : Cyriaque Atindogbé (Université d'Abomey-Calavi)

Résumé

A smooth vector field on a pseudo-Riemannian manifold $(M,g)$ is conformal whenever its local flow leaves invariant the conformal class $[g]$. In Lorentzian spaces, we highlight how the presence of such vector fields affects the geometry and the topology of various kinds of hypersurfaces.

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