Redshift drift constraints on holographic dark energy

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• 作者：Dong-Ze He ; Jing-Fei Zhang ; Xin Zhang
• 关键词：redshift drift ; Sandage ; Loeb test ; holographic dark energy ; Ricci dark energy ; cosmological constraints
• 刊名：Science China Physics, Mechanics & Astronomy
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：60
• 期：3
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics, general; Classical and Continuum Physics; Astronomy, Observations and Techniques;
• 出版者：Science China Press
• ISSN：1869-1927
• 卷排序：60

文摘

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 ≲ z ≲ 5, 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 H₀ 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.