论文标题
相互作用的黑暗部门的宇宙学扰动：映射场和流体
Cosmological perturbations in the interacting dark sector: Mapping fields and fluids
论文作者
论文摘要
没有独特的方法来描述黑暗能量销事的交互作用，因为我们几乎没有关于黑暗部门的性质和动态的信息。因此，在文献中的许多现象学暗物质相互作用模型中，黑暗部门的相互作用强度$q_ν$都是手工引入的。要求在黑暗扇区中的相互作用强度$q_ν$必须具有场理论描述，我们获得了一种独特的相互作用强度。我们显示了$ f（r，χ）$模型的字段与流体之间的等价性，其中$ f $是$ r $和经典标量字段$χ$的任意，平滑功能，代表暗物质。在扰动中，我们表明，对于这种独特的相互作用形式，存在\ emph {classical}田间理论描述与相互作用的暗能物质和暗物质相互作用的现象学流体描述之间的一对一映射。然后，我们根据现场理论描述将文献中考虑的相互作用的暗能模型分为两类。我们引入了一种新型的自主系统及其对一般相互作用的黑暗部门的稳定性分析。我们表明，黑暗能源主导的时期比非相互作用的系统早于针对特定标量场电位和一系列耦合强度的更早发生。
There is no unique way to describe the dark energy-dark matter interaction, as we have little information about the nature and dynamics of the dark sector. Hence, in many of the phenomenological dark matter fluid interaction models in the literature, the interaction strength $Q_ν$ in the dark sector is introduced by hand. Demanding that the interaction strength $Q_ν$ in the dark sector must have a field theory description, we obtain a unique form of interaction strength. We show the equivalence between the fields and fluids for the $f(R,χ)$ model where $f$ is an arbitrary, smooth function of $R$ and classical scalar field $χ$, which represents dark matter. Up to first order in perturbations, we show that the one-to-one mapping between the \emph{classical} field theory description and the phenomenological fluid description of interacting dark energy and dark matter exists \emph{only} for this unique form of interaction. We then classify the interacting dark energy models considered in the literature into two categories based on the field-theoretic description. We introduce a novel autonomous system and its stability analysis for the general interacting dark sector. We show that the dark-energy dominated epoch occurs earlier than the non-interacting systems for a specific scalar field potential and a range of coupling strengths.
