The Stability of Einstein static universe in the DGP braneworld
The Stability of Einstein static universe in the DGP braneworld
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DOI：
10.1016/j.physletb.2010.05.040
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发表时间：
2010-05
影响因子：
4.4
通讯作者：
Kaituo Zhang;Puxun Wu;Hongwei Yu
中科院分区：
文献类型：
--
作者：
Kaituo Zhang;Puxun Wu;Hongwei Yu
这封信研究了 DGP 膜世界场景中爱因斯坦静态宇宙的稳定性。分析了 DGP 模型的由 {epsilon}={+-}1 表示的两个独立分支。假设宇宙中存在状态方程为常数w的完美流体，我们发现，对于{epsilon}=1的分支，不存在稳定的爱因斯坦静态解，而对于{epsilon}=-1的情况，存在爱因斯坦静态宇宙，并且当-1<w<-1/3时是稳定的。因此，宇宙可以永远保持这种稳定状态，并可能经历一系列无限的、非奇异的振荡。因此，标准宇宙学模型中的大爆炸奇点问题可以得到解决。
The stability of an Einstein static universe in the DGP braneworld scenario is studied in this Letter. Two separate branches denoted by {epsilon}={+-}1 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 {epsilon}=1, there is no a stable Einstein static solution, while, for the case with {epsilon}=-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.