http://arxiv.org/abs/1501.03874
By detecting redshift drift in the spectra of Lyman-$\alpha$ forest of distant quasars, Sandage-Loeb (SL) test directly measures the expansion of the universe, covering the “redshift desert” of $2 \lesssim z \lesssim5$. Thus this method is definitely an important supplement to the other geometric measurements and will play a crucial role in cosmological constraints. In this paper, we quantify the ability of SL test signal by a CODEX-like spectrograph for constraining interacting dark energy. Four typical interacting dark energy models are considered: (\romannumeral1) $Q=\gamma H\rho_c$, (\romannumeral2) $Q=\gamma H\rho_{de}$, (\romannumeral3) $Q=\gamma H_0\rho_c$, and (\romannumeral4) $Q=\gamma H_0\rho_{de}$. The results show that for all the considered interacting dark energy models, relative to the current joint SN+BAO+CMB+$H_0$ observations, the constraints on $\Omega_m$ and $H_0$ would be improved by about 60\% and 30–40\%, while the constraints on $w$ and $\gamma$ would be slightly improved, with a 30-yr observation of SL test. We also explore the impact of SL test on future joint geometric observations. In this analysis, we take the model with $Q=\gamma H\rho_c$ as an example, and simulate future SN and BAO data based on the space-based project JDEM. We find that in the future geometric constraints, the SL 30-yr observation would help improve the measurement precisions of $\Omega_m$, $H_0$, $w$ and $\gamma$ by more than 75\%, 15\%, 65\%, and 80\%, respectively.
J. Geng, Y. Li, J. Zhang, et. al.
Mon, 19 Jan 15
3/50
Comments: 6 pages, 5 figures. arXiv admin note: text overlap with arXiv:1407.7123
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