论文标题
$λ$ CDM与现象学上新兴的暗能量模型之间的贝叶斯比较
A Bayesian comparison between $Λ$CDM and phenomenologically emergent dark energy models
论文作者
论文摘要
在这项工作中，我们使用\ cite {li：2019yem}的最近提出的现象学新兴暗能量（PEDE）模型，使用了扩展和扰动水平中的最新观测数据。应用统计的贝叶斯证据以及AIC和BIC信息标准，我们将PEDE模型与平面和非流量宇宙中的一致性$λ$ CDM模型进行了比较。我们将观察数据集组合为（i）扩展数据（CMB除外），（ii）扩展数据（包括CMB）和（iii）与增长率数据集的扩展数据。我们的统计结果表明，Flat-$λ$ CDM型号仍然是最佳模型。在扩展数据（包括CMB）的情况下，我们观察到平面模型与观察值以及一致性$λ$ CDM宇宙非常一致。在（i）和（iii）的情况下，平坦和非平坦几何形状中的PEDE模型都不受到青睐。特别是，我们看到，在扰动级别，PEDE模型不能像标准$λ$ CDM宇宙学一样拟合观测值。作为模型的能力，我们表明PEDE模型可以减轻局部观测值和普朗克在标准宇宙学中推断估计之间出现的哈勃恒定值的张力。
In this work we examine the recently proposed phenomenological emergent dark energy (PEDE) model by \cite{Li:2019yem}, using the latest observational data in both expansion and perturbation levels. Applying the statistical Bayesian evidence as well as the AIC and BIC information criteria, we compare the PEDE model with the concordance $Λ$CDM model in both flat and non-flat universes. We combine the observational datasets as (i) expansion data (except CMB), (ii) expansion data (including CMB) and (iii) expansion data jointed to the growth rate dataset. Our statistical results show that the flat- $Λ$CDM model is still the best model. In the case of expansion data (including CMB), we observe that the flat- PEDE model is well consistent with observations as well as the concordance $Λ$CDM universe. While in the cases of (i) and (iii), the PEDE models in both of the flat and non-flat geometries are not favored. In particular, we see that in the perturbation level the PEDE model can not fit the observations as equally as standard $Λ$CDM cosmology. As the ability of the model, we show that the PEDE models can alleviate the tension of Hubble constant value appearing between the local observations and Planck inferred estimation in standard cosmology.
