Abstract
We deal with spacelike hypersurfaces immersed with some constant rth mean curvature in a steady state type spacetime, that is, a generalized Robertson–Walker spacetime of the type \({-\mathbb{R} \times_{e^t} M^n}\). In this setting, supposing that the fiber M n of the ambient space has nonnegative constant sectional curvature, we establish characterization results concerning domains of the spacelike slices \({\{t\} \times M^n}\). Afterwards, we apply such characterization results to study the uniqueness of complete spacelike hypersurfaces with one end in such a ambient space.
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