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arXiv 1906.11697astro-ph.COgr-qc
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具有动力学耦合的暗扇区

Dark sectors with dynamical coupling

Weiqiang Yang, Olga Mena, Supriya Pan, Eleonora Di Valentino

备注：
11 pages, 4 Tables, 6 captioned figures; version accepted for publication by Physical Review D
发表信息：
Phys. Rev. D 100, 083509 (2019)
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摘要：

耦合暗物质-暗能量的情况下，通过一个无量纲参数$ξ$，它控制的强度，它们的相互作用建模。虽然这种耦合通常被假设为常数，但没有基本的物理定律或对称性禁止依赖于时间的$ξ$参数。因此，两个暗区之间最普遍和完整的相互作用场景应该允许这种可能性，本研究的主要目的是通过最新和最准确的早期和晚期宇宙观测来约束两种可能的和动机良好的耦合宇宙学。我们发现，宇宙微波背景辐射的数据本身更倾向于$ξ(z) >0$，因此更少量的暗物质，减轻了一些关键的和众所周知的宇宙学数据的紧张局势。一个客观的评估贝叶斯证据的耦合模型在这里探索显示没有特别的偏好存在一个动态的暗部耦合。

英文摘要：

Coupled dark matter-dark energy scenarios are modeled via a dimensionless parameter $ξ$, which controls the strength of their interaction. While this coupling is commonly assumed to be constant, there is no underlying physical law or symmetry that forbids a time-dependent $ξ$ parameter. The most general and complete interacting scenarios between the two dark sectors should therefore allow for such a possibility, and it is the main purpose of this study to constrain two possible and well-motivated coupled cosmologies by means of the most recent and accurate early and late-time universe observations. We find that CMB data alone prefers $ξ(z) >0$ and therefore a smaller amount of dark matter, alleviating some crucial and well-known cosmological data tensions. An objective assessment of the Bayesian evidence for the coupled models explored here shows no particular preference for the presence of a dynamical dark sector coupling.

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