论文标题
关于黑暗扇区耦合的动力学
On the dynamics of a dark sector coupling
论文作者
论文摘要
相互作用的暗能量模型可能在解释现代宇宙学中几个重要的观察性问题方面起着至关重要的作用，并且也可以为当前的宇宙张力提供解决方案。由于黑暗部门的现象学可能非常富裕，因此不应将相互作用的模型限制为具有在宇宙时间恒定的耦合参数，而不是允许其动力学行为，因为在处理其他暗能量时，它在文献中是常见的实践，例如状态的黑暗能量方程。我们在这里介绍了当前宇宙学限制在各种各样的相互作用模型上的汇编，其中研究了相互作用函数的耦合参数和状态的暗能量方程的场景，可以是恒定的或动态的。 For the most general schemes, in which both the coupling parameter of the interaction function and the dark energy equation of state are dynamical, we find $95\%$~CL evidence for a dark energy component at early times and slightly milder evidence for a dynamical dark coupling for the most complete observational data set exploited here, which includes CMB, BAO and Supernova Ia measurements.有趣的是，在某些情况下，黑暗能源组件与早期的宇宙学恒定案例不同，并且与今天的零耦合不同，可以减轻此处考虑的完整数据集合的$ H_0 $和$ S_8 $张力。由于黑暗扇区之间的能量交换，物质能量密度和聚类参数的当前值$σ_8$从其$λ$ cdm的值转移。这一事实使未来的调查，尤其是那些专注于弱透镜测量值的调查，是测试黑暗能源部门的性质和耦合的独特工具。
Interacting dark energy models may play a crucial role in explaining several important observational issues in modern cosmology and also may provide a solution to current cosmological tensions. Since the phenomenology of the dark sector could be extremely rich, one should not restrict the interacting models to have a coupling parameter which is constant in cosmic time, rather allow for its dynamical behavior, as it is common practice in the literature when dealing with other dark energy properties, as the dark energy equation of state. We present here a compendium of the current cosmological constraints on a large variety of interacting models, investigating scenarios where the coupling parameter of the interaction function and the dark energy equation of state can be either constant or dynamical. For the most general schemes, in which both the coupling parameter of the interaction function and the dark energy equation of state are dynamical, we find $95\%$~CL evidence for a dark energy component at early times and slightly milder evidence for a dynamical dark coupling for the most complete observational data set exploited here, which includes CMB, BAO and Supernova Ia measurements. Interestingly, there are some cases where a dark energy component different from the cosmological constant case at early times together with a coupling different from zero today, can alleviate both the $H_0$ and $S_8$ tension for the full dataset combination considered here. Due to the energy exchange among the dark sectors, the current values of the matter energy density and of the clustering parameter $σ_8$ are shifted from their $Λ$CDM-like values. This fact makes future surveys, especially those focused on weak lensing measurements, unique tools to test the nature and the couplings of the dark energy sector.
