https://doi.org/10.1140/epjc/s10052-015-3581-8
Regular Article - Theoretical Physics
Redshift drift exploration for interacting dark energy
1
Department of Physics, College of Sciences, Northeastern University, Shenyang, 110004, China
2
Center for High Energy Physics, Peking University, Beijing, 100080, China
* e-mail: zhangxin@mail.neu.edu.cn
Received:
14
February
2015
Accepted:
25
July
2015
Published online:
4
August
2015
By detecting redshift drift in the spectra of the Lyman-
forest of distant quasars, the Sandage–Loeb (SL) test directly measures the expansion of the universe, covering the “redshift desert” of 
. 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 the SL test signal by a CODEX-like spectrograph for constraining interacting dark energy. Four typical interacting dark energy models are considered: (i) 
, (ii) 
, (iii) 
, and (iv) 
. The results show that for all the considered interacting dark energy models, relative to the current joint SN 
BAO CMB 
observations, the constraints on 
and would be improved by about 60 and 30–40 %, while the constraints on w and 
would be slightly improved, with a 30-year observation of the SL test. We also explore the impact of the SL test on future joint geometric observations. In this analysis, we take the model with as an example, and we simulate future SN and BAO data based on the space-based project WFIRST. We find that with the future geometric constraints, the redshift drift observations would help break the geometric degeneracies in a meaningful way, thus the measurement precisions of , , w, and could be substantially improved using future probes.
© The Author(s), 2015
