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arXiv 0709.4398math.DGmath-phmath.MP
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定常状态空间中具有常中曲率的类空超曲面

Spacelike hypersurfaces with constant mean curvature in the steady state space

Alma L. Albujer, Luis J. Alias

摘要:

我们考虑在称为定常状态空间的de Sitter空间的开区域中具有常中曲率的完备类空超曲面。我们证明了如果超曲面是有界的远离无限的环境空间,那么中曲率必须是H=1。此外,在二维情形下,我们得到了唯一的完全类空曲面的恒定中曲率,有界远离无穷远是全脐平坦曲面。我们还得到了一些其他的结果,超曲面的有界远离未来无穷大。最后,使用等距等价模型的稳定状态空间,我们将我们的结果扩展到更广泛的时空家庭。

英文摘要:

We consider complete spacelike hypersurfaces with constant mean curvature in the open region of de Sitter space known as the steady state space. We prove that if the hypersurface is bounded away from the infinity of the ambient space, then the mean curvature must be H=1. Moreover, in the 2-dimensional case we obtain that the only complete spacelike surfaces with constant mean curvature which are bounded away from the infinity are the totally umbilical flat surfaces. We also derive some other consequences for hypersurfaces which are bounded away from the future infinity. Finally, using an isometrically equivalent model for the steady state space, we extend our results to a wider family of spacetimes.

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