Speaker
Prof.
Oscar Palmas
(Facultad de Ciencias, UNAM, Mexico)
Description
Given a semi-Riemannian manifold $\bar M$ with metric $\bar g$, a submanifold $M$ of $\bar M$ is null if the restriction $g$ of $\bar g$ to $M$ is degenerate. These objects deserve some attention, because of their connection with some areas like the study of black holes and others. In general, some properties of $M$ cannot be studied with the usual differential geometric methods, but here we discuss the case of null hypersurfaces in Lorentzian space forms. This is a joint work with M. Navarro and D. Solis (UADY-Mexico)
