On the geometry of linear Weingarten spacelike hypersurfaces in the de Sitter space

Our purpose is to study the geometry of linear Weingarten spacelike hypersurfaces immersed in the de Sitter space $mathbb{S}_1^{n + 1} $ . In this setting, by using as main analytical tool a suitable maximum principle for complete noncompact Riemannian manifolds, we establish new characterizations of the hyperbolic cylinders of $mathbb{S}_1^{n + 1} $ . In the compact case, we obtain a rigidity result concerning to a such hypersurface according to the length of its second fundamental form.