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arXiv 1202.4060astro-ph.COgr-qchep-phhep-th
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暗能量与宇宙的命运

Dark Energy and Fate of the Universe

Xiao-Dong Li, Shuang Wang, Qing-Guo Huang, Xin Zhang, Miao Li

备注：
5 pages, 3 figures; typos corrected, publication version, Sci China-Phys Mech Astron, doi: 10.1007/s11433-012-4748-z
发表信息：
Science China-Physics Mechanics & Astronomy 55 (2012) 1330-1334
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摘要：

我们通过对暗能量$w(z)=w_0+w_a({\ln (2+z)\over 1+z}-\ln2)$的无发散参数化来探索宇宙的最终命运。与CPL参数化方法不同，该参数化方法对高红移和负红移都有良好的有界行为，因此可以真正覆盖许多理论暗能量模型。在使用当前的宇宙学观测约束了这种参数化的参数空间之后，我们发现，在95.4%的置信水平下，我们的宇宙在以大撕裂结束之前仍然可以存在至少16.7 Gyr。此外，对于幻影能量主导的宇宙，我们发现引力束缚系统将在大撕裂之前的时间$t \simeq P\sqrt{2|1+3w(-1)|}/[6π|1+w(-1)|]$被摧毁，其中$P$是围绕该系统的圆形轨道的周期。

英文摘要：

We explore the ultimate fate of the Universe by using a divergence-free parametrization for dark energy $w(z)=w_0+w_a({\ln (2+z)\over 1+z}-\ln2)$. Unlike the CPL parametrization, this parametrization has well behaved, bounded behavior for both high redshifts and negative redshifts, and thus can genuinely cover many theoretical dark energy models. After constraining the parameter space of this parametrization by using the current cosmological observations, we find that, at the 95.4% confidence level, our Universe can still exist at least 16.7 Gyr before it ends in a big rip. Moreover, for the phantom energy dominated Universe, we find that a gravitationally bound system will be destroyed at a time $t \simeq P\sqrt{2|1+3w(-1)|}/[6π|1+w(-1)|]$, where $P$ is the period of a circular orbit around this system, before the big rip.

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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