Probing modified gravity theories with the Sandage-Loeb test
Probing modified gravity theories with the Sandage-Loeb test
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DOI：
10.1103/physrevd.88.023003
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发表时间：
2013-06
影响因子：
5
通讯作者：
Zhengxiang Li;Kai Liao;Puxun Wu;Hongwei Yu;Zong-hong Zhu
中科院分区：
文献类型：
--
作者：
Zhengxiang Li;Kai Liao;Puxun Wu;Hongwei Yu;Zong-hong Zhu
在本文中，我们量化的能力，未来的测量的Sandage-Loeb测试信号从宇宙动力学实验类光谱仪约束一些流行的修改的引力理论，包括DGP膜世界的情况下，$f（R）$修改的引力和$f（T）$引力理论。我们发现，Sandage-Loeb检验测量能够打破模型参数之间的简并显着，从而大大改善宇宙学约束的所有有关修改的引力理论时，结合最新的观测CMB-位移参数。然而，它们产生几乎相同的模型参数之间的简并方向的距离比数据来自宇宙微波背景和重子声学振荡（CMB/BAO）的最新观测。此外，对于$f（R）$修正引力，Sandage-Loeb检验可以提供与CMB/BAO完全不同的模型参数空间有界区域，从而补充了强互补约束。
In this paper, we quantify the ability of a future measurement of the Sandage-Loeb test signal from the Cosmic-Dynamic-Experiment-like spectrograph to constrain some popular modified gravity theories including DGP brane-world scenario, $f(R)$ modified gravity and $f(T)$ gravity theory. We find that the Sandage-Loeb test measurements are able to break degeneracies between model parameters markedly and thus greatly improve cosmological constraints for all concerned modified gravity theories when combined with the latest observations of CMB--shift parameter. However, they yield almost the same degeneracy directions between model parameters as that from the distance ratio data derived from the latest observations of the cosmic microwave background and baryonic acoustic oscillations (CMB/BAO). Moreover, for the $f(R)$ modified gravity, the Sandage-Loeb test could provide completely different bounded regions in model parameters space as compared to CMB/BAO and thus supplement strong complementary constraints.