https://t.co/TfOjXdPPmI G Colombo et. al. A note on spacelike hypersurfaces and timelike conformal vectors https://t.co/xtOr5xTsZX
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hypersurfaces in spacetimes carrying a conformal, strictly expanding, timelike vector field. [3/3 of https://t.co/c4HKgiejar]
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$H\geq\rho'/h\rho$ everywhere on the hypersurface. The conclusion also holds, under suitable assumptions on the immersion, when the hypersurface is complete and noncompact. A similar rigidity property is shown for compact [2/3 of https://t.co/c4HKgiejar]