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arXiv 2201.07011astro-ph.CO
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用最近的观测和即将到来的引力波数据研究宇宙学的动力学模型

Investigating the dynamical models of cosmology with recent observations and upcoming gravitational-wave data

Jie Zheng, Yun Chen, Tengpeng Xu, Zong-Hong Zhu

备注：
12 pages, 3 figures, 3 tables. Accepted for publication in the European Physical Journal - Plus (EPJ Plus). arXiv admin note: text overlap with arXiv:2107.08916; The manuscript arXiv:2107.08916 will not be submitted to or published in any journal
发表信息：
The European Physical Journal Plus, 2022, 137, 509
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摘要：

我们探讨和比较的能力，最近的观测标准的宇宙学探测器和未来的观测引力波（GW）的标准海妖约束宇宙学参数。它是在两个典型的宇宙学动力学模型的框架下进行的，具有$ω(z) = ω_0 +ω_a*z/(1+z)$的$ω_0ω_a$ CDM模型和具有$ρ_X\proptoρ_ma^ξ$的$ξ$指数模型，其中$ω(z)$是暗能量状态方程，$ρ_X$和$ρ_m$分别是暗能量和物质的能量密度。在宇宙学分析中，使用的数据集包括标准宇宙学探测器的最新观测，即，Ia型超新星（SNe Ia），重子声振荡（BAO）和宇宙微波背景（CMB），以及模拟GW标准警报器样本与1000合并中子星事件预计从第三代探测器。在$ω_0ω_a$ CDM和$ξ$ -index模型的情况下，结果表明，模拟GW样本可以减少哈勃常数$H_0$的不确定性约50%，相对于联合SNe+BAO+CMB样本，SNe+BAO+CMB样本在限制其他参数方面表现出更好的性能。此外，贝叶斯证据被应用到比较的动力学模型与$Λ$ CDM模型。从SNe+BAO+CMB样本计算的贝叶斯证据表明，$Λ$ CDM模型是支持度最高的模型，而且$ω_0ω_a$ CDM模型比$ξ$ -index模型更具竞争力。

英文摘要：

We explore and compare the capabilities of the recent observations of standard cosmological probes and the future observations of gravitational-wave (GW) standard sirens on constraining cosmological parameters. It is carried out in the frameworks of two typical dynamical models of cosmology, i.e., the $ω_0ω_a$CDM model with $ω(z) = ω_0 +ω_a*z/(1+z)$, and the $ξ$-index model with $ρ_X\proptoρ_ma^ξ$, where $ω(z)$ is the dark energy equation of state, and $ρ_X$ and $ρ_m$ are the energy densities of dark energy and matter, respectively. In the cosmological analysis, the employed data sets include the recent observations of the standard cosmological probes, i.e., Type Ia supernovae (SNe Ia), baryon acoustic oscillation (BAO) and cosmic microwave background (CMB), and also the mock GW standard siren sample with 1000 merging neutron star events anticipated from the third-generation detectors. In the scenarios of both $ω_0ω_a$CDM and $ξ$-index models, it turns out that the mock GW sample can reduce the uncertainty of the Hubble constant $H_0$ by about 50\% relative to that from the joint SNe+BAO+CMB sample; nevertheless, the SNe+BAO+CMB sample demonstrates better performance on limiting other parameters. Furthermore, the Bayesian evidence is applied to compare the dynamical models with the $Λ$CDM model. The Bayesian evidences computed from the SNe+BAO+CMB sample reveal that the $Λ$CDM model is the most supported one; moreover, the $ω_0ω_a$CDM model is more competitive than the $ξ$-index model.

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