# On complete maximal hypersurfaces in Robertson-Walker spacetimes with flat fiber

 Orateur: SANCHEZ PELEGRIN José Antonio Localisation: Université de Grenade, Espagne Type: Séminaire de géométrie Site: Hors LAMA , IMJ P7 Salle: 2015 Date de début: 23/01/2017 - 13:30 Date de fin: 23/01/2017 - 13:30

In this talk, we will deal with complete maximal hypersurfaces in spatially open $(n+1)$-dimensional Robertson-Walker spacetimes with flat fiber. Indeed, under natural geometric and physical assumptions we will obtain a new Calabi-Bernstein type result for these hypersurfaces as well as some nonexistence ones. To conclude, we will also apply these results to some relevant spacetimes, such as the steady state spacetime, the Einstein-de Sitter spacetime and certain radiation models.