arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.03979astro-ph.COgr-qchep-ph
收藏

用21 cm强度映射实验约束相互作用暗能量模型的展望

Prospects for Constraining Interacting Dark Energy Models with 21 cm Intensity Mapping Experiments

Ming Zhang, Bo Wang, Peng-Ju Wu, Jing-Zhao Qi, Yidong Xu, Jing-Fei Zhang, Xin Zhang

备注：
13 pages, 5 figures
发表信息：
Astrophys. J. 918 (2021) 56
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

利用中性氢强度映射（IM）实验产生的模拟数据，我们预测了相互作用暗能量模型中宇宙学参数的约束。本文仅考虑能量转移率为$Q=βHρ_{\rm c}$的相互作用暗能量模型，并以BINGO、FAST、SKA 1-MID和天籁等模型作为21 cm IM实验的典型例子。我们发现，天籁柱阵列将在相互作用暗能量模型的约束中发挥重要作用。在理想的前景去除和定标条件下，利用单独的天籁观测数据，我们得到了I $Λ$ CDM模型中的$σ(H_0)=0.19$ km s $^{-1}$ Mpc $^{-1}$，$σ(Ω_{\rm m})=0.0033$和$σ(σ_8)=0.0033$，它们比Planck+光学BAO（即光学星系巡天）的结果好得多.然而，与Planck+optical BAO相比，单独的Tianlai数据不能对耦合参数$β$提供非常严格的约束，而Planck+Tianlai数据可以对$σ(β)=0.00023$提供相当严格的约束，这是由于数据组合很好地打破了参数简并。在I-$w$ CDM模型中，我们从Planck+Tianlai得到了$σ(β)=0.00079$和$σ(w)=0.013$.此外，我们还对BINGO、FAST、SKA 1-MID和天籁四种模型在相互作用暗能量模型中的应用进行了详细的比较。我们表明，未来的21厘米IM实验将提供一个有用的工具，探索暗能量的性质，并在测量暗能量和暗物质之间的耦合发挥了重要作用。

英文摘要：

We forecast constraints on cosmological parameters in the interacting dark energy models using the mock data generated for neutral hydrogen intensity mapping (IM) experiments. In this work, we only consider the interacting dark energy models with energy transfer rate $Q=βHρ_{\rm c}$, and take BINGO, FAST, SKA1-MID, and Tianlai as typical examples of the 21 cm IM experiments. We find that the Tianlai cylinder array will play an important role in constraining the interacting dark energy model. Assuming perfect foreground removal and calibration, and using the Tianlai-alone data, we obtain $σ(H_0)=0.19$ km s$^{-1}$ Mpc$^{-1}$, $σ(Ω_{\rm m})=0.0033$ and $σ(σ_8)=0.0033$ in the I$Λ$CDM model, which are much better than the results of Planck+optical BAO (i.e. optical galaxy surveys). However, the Tianlai-alone data cannot provide a very tight constraint on the coupling parameter $β$ compared with Planck+optical BAO, while the Planck+Tianlai data can give a rather tight constraint of $σ(β)=0.00023$ due to the parameter degeneracies being well broken by the data combination. In the I$w$CDM model, we obtain $σ(β)=0.00079$ and $σ(w)=0.013$ from Planck+Tianlai. In addition, we also make a detailed comparison among BINGO, FAST, SKA1-MID, and Tianlai in constraining the interacting dark energy models. We show that future 21 cm IM experiments will provide a useful tool for exploring the nature of dark energy and play a significant role in measuring the coupling between dark energy and dark matter.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

↑