On the mean curvature of spacelike surfaces in certain three-dimensional Robertson-Walker spacetimes and Calabi-Bernstein's type problems (Q2655203)

In the paper under review, many interesting results, under boundedness assumptions either on the mean curvature function of the space-like surface or on the restriction of the time coordinate on the surface when the mean curvature is a constant, for the space-like slices in a certain Robertson-Walker space-time are proved. Also the nonparametric case is considered.