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arXiv 1005.4201gr-qcastro-ph.CO
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DGP膜世界中爱因斯坦静态宇宙的稳定性

The stability of Einstein static universe in the DGP braneworld

Kaituo Zhang, Puxun Wu, Hongwei Yu

摘要:

本文研究了DGP膜世界方案中爱因斯坦静态宇宙的稳定性。分析了DGP模型的两个独立分支,用$ε=\pm1$表示。假设宇宙中存在一个理想流体,其状态方程为常数$w$,我们发现,对于$ε=1$分支,不存在稳定的爱因斯坦静态解,而对于$ε=-1$分支,爱因斯坦静态宇宙存在,并且当$-1<w<-1/3$时,爱因斯坦静态宇宙是稳定的.因此,宇宙可以在过去永远保持这种稳定状态,并可能经历一系列无限的非奇异振荡。因此,标准宇宙学模型中的大爆炸奇点问题可以得到解决。

英文摘要:

The stability of an Einstein static universe in the DGP braneworld scenario is studied in this paper. Two separate branches denoted by $ε=\pm1$ of the DGP model are analyzed. Assuming the existence of a perfect fluid with a constant equation of state, $w$, in the universe, we find that, for the branch with $ε=1$, there is no a stable Einstein static solution, while, for the case with $ε=-1$, the Einstein static universe exists and it is stable when $-1<w<-1/3$. Thus, the universe can stay at this stable state past-eternally and may undergo a series of infinite, non-singular oscillations. Therefore, the big bang singularity problem in the standard cosmological model can be resolved.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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