Abstract
Several uniqueness results for the spacelike slices in certain Robertson–Walker spacetimes are proved under boundedness assumptions either on the mean curvature function of the spacelike surface or on the restriction of the time coordinate on the surface when the mean curvature is a constant. In the nonparametric case, a uniqueness result and a nonexistence one are proved for bounded entire solutions of some constant mean curvature spacelike differential equations.
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Romero, A., Rubio, R.M. On the mean curvature of spacelike surfaces in certain three-dimensional Robertson–Walker spacetimes and Calabi–Bernstein’s type problems. Ann Glob Anal Geom 37, 21–31 (2010). https://doi.org/10.1007/s10455-009-9171-y
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DOI: https://doi.org/10.1007/s10455-009-9171-y