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arXiv 1607.05643astro-ph.COhep-ph
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全息暗能量的红移漂移约束

Redshift drift constraints on holographic dark energy

Dong-Ze He, Jing-Fei Zhang, Xin Zhang

摘要:

Sandage-Loeb(SL)检验是探测暗能量的一种很有前途的方法,因为它测量了遥远类星体的$α$森林光谱中的红移漂移,覆盖了$2\lesssim z\lesssim5$的“红移沙漠”,这是现有宇宙学观测所没有覆盖的。因此,它可以为当前的宇宙学观测提供重要的补充。本文探讨了SL检验对两种典型全息暗能量模型的宇宙学约束精度的影响,原始的全息暗能量(HDE)模型和里奇全息暗能量(RDE)模型。为了避免数据不一致,我们使用基于当前组合观测数据的最佳拟合模型作为基准模型来模拟30个模拟SL测试数据。结果表明,SL检验可以有效地打破现有宇宙学观测中物质密度$Ω_{m0}$与哈勃常数$H_0$之间存在的强简并性.对于所考虑的两个典型的暗能量模型,SL试验的30年观测不仅可以显著提高$Ω_{m0}$和$h$的约束精度,而且可以显著提高模型参数$c$和$α$的约束精度.

英文摘要:

The Sandage-Loeb (SL) test is a promising method for probing dark energy because it measures the redshift drift in the spectra of Lyman-$α$ forest of distant quasars, covering the "redshift desert" of $2\lesssim z\lesssim5$, which is not covered by existing cosmological observations. Therefore, it could provide an important supplement to current cosmological observations. In this paper, we explore the impact of SL test on the precision of cosmological constraints for two typical holographic dark energy models, i.e., the original holographic dark energy (HDE) model and the Ricci holographic dark energy (RDE) model. To avoid data inconsistency, we use the best-fit models based on current combined observational data as the fiducial models to simulate 30 mock SL test data. The results show that SL test can effectively break the existing strong degeneracy between the present-day matter density $Ω_{m0}$ and the Hubble constant $H_0$ in other cosmological observations. For the considered two typical dark energy models, not only can a 30-year observation of SL test improve the constraint precision of $Ω_{m0}$ and $h$ dramatically, but can also enhance the constraint precision of the model parameters $c$ and $α$ significantly.

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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