论文标题
在扩展的粘性暗能能模型中物质扰动的增长
Growth of matter perturbations in the extended viscous dark energy models
论文作者
论文摘要
在这项工作中，我们在物质扰动的背景下研究了扩展的粘性暗能量模型。为此，我们通过非胶凝熵和粘性的暗能量对平坦的Friedmann-Lema-Robertson-Walker宇宙进行了替代解释。我们实施相对论方程式，以使物质波动的增长为平滑的暗能量。结果，我们表明，物质密度的对比与高红移中的$λ$ CDM模型相似。在晚期，它与标准模型略有不同。使用最新的几何和增长速率观察数据，我们进行贝叶斯分析以限制参数和比较模型。我们看到我们的粘性模型与宇宙学探针兼容，$λ$ CDM以$1σ$置信度的水平恢复。粘性的暗能量模型可缓解$ H_0 $ in $ 2 \ sim3σ$的张力。但是，通过涉及$σ_8$张力，有些型号可以减轻它。在模型选择框架中，数据丢弃了扩展的粘性暗能能模型。
In this work, we study the extended viscous dark energy models in the context of matter perturbations. To do this, we assume an alternative interpretation of the flat Friedmann-Lemaître-Robertson-Walker Universe, through the nonadditive entropy and the viscous dark energy. We implement the relativistic equations to obtain the growth of matter fluctuations for a smooth version of dark energy. As result, we show that the matter density contrast evolves similarly to the $Λ$CDM model in high redshift; in late time, it is slightly different from the standard model. Using the latest geometrical and growth rate observational data, we carry out a Bayesian analysis to constrain parameters and compare models. We see that our viscous models are compatible with cosmological probes, and the $Λ$CDM recovered with a $1σ$ confidence level. The viscous dark energy models relieve the tension of $H_0$ in $2 \sim 3 σ$. Yet, by involving the $σ_8$ tension, some models can alleviate it. In the model selection framework, the data discards the extended viscous dark energy models.
