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arXiv 1807.03022astro-ph.CO
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用参数化后Friedmann方法研究扰动宇宙中相互作用全息暗能量

Exploring interacting holographic dark energy in a perturbed universe with parameterized post-Friedmann approach

Lu Feng, Yun-He Li, Fei Yu, Jing-Fei Zhang, Xin Zhang

备注：
8 pages, 4 figures
发表信息：
Eur. Phys. J. C 78 (2018) no.10, 865
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摘要：

研究了暗能量与暗物质相互作用的全息暗能量模型。特别地，我们考虑在扰动宇宙的背景下的相互作用全息暗能量模型，这是从来没有在文献中调查。为了避免相互作用暗能量宇宙学中的大尺度不稳定性问题，我们采用广义的参数化后Friedmann方法来处理模型中的暗能量扰动.我们使用当前的观测数据来约束模型。由于在模型中考虑了宇宙学扰动，我们可以采用红移空间畸变（RSD）测量来约束模型，除了使用膨胀历史的测量，这在文献中从未做过。我们发现，与没有相互作用的全息暗能量模型相比，对于$Q=βHρ_{\rm c}$和$Q=βH_0ρ_{\rm c}$的情况下，相互作用的全息暗能量模型更受当前数据的青睐。还发现，在RSD数据的帮助下，对于$Q=βH_0ρ_{\rm c}$的情况，在$2.95σ$统计显著性处可以检测到正偶联$β$。

英文摘要：

The model of holographic dark energy in which dark energy interacts with dark matter is investigated in this paper. In particular, we consider the interacting holographic dark energy model in the context of a perturbed universe, which was never investigated in the literature. To avoid the large-scale instability problem in the interacting dark energy cosmology, we employ the generalized version of the parameterized post-Friedmann approach to treat the dark energy perturbations in the model. We use the current observational data to constrain the model. Since the cosmological perturbations are considered in the model, we can then employ the redshift-space distortions (RSD) measurements to constrain the model, in addition to the use of the measurements of expansion history, which was either never done in the literature. We find that, for both the cases with $Q=βHρ_{\rm c}$ and $Q=βH_0ρ_{\rm c}$, the interacting holographic dark energy model is more favored by the current data, compared to the holographic dark energy model without interaction. It is also found that, with the help of the RSD data, a positive coupling $β$ can be detected at the $2.95σ$ statistical significance for the case of $Q=βH_0ρ_{\rm c}$.

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