arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.00610astro-ph.CO
收藏

耦合暗能量和$H_0$张力的更新

Update on Coupled Dark Energy and the $H_0$ tension

Adrià Gómez-Valent, Valeria Pettorino, Luca Amendola

摘要:

在这项工作中,我们提供了更新的约束耦合暗能量(CDE)宇宙学与Peekeen-Ratra(PR)的潜力和恒定的耦合强度$β$。这个修改后的引力方案在暗物质粒子之间引入了第五种力,由扮演暗能量角色的标量场介导。暗物质粒子的质量并不保持恒定,而是作为标量场的函数随时间变化。在这里,我们专注于模型的现象学行为,并评估其描述更新的宇宙学数据集,包括普朗克2018宇宙微波背景(CMB)温度,极化和透镜,重子声学振荡,Ia型超新星的万神殿汇编,宇宙计时器的$H(z)$数据,以及红移空间扭曲的能力。我们还研究了这是本地测量的$H_0$从SH 0 ES和强透镜的时间延迟数据从H 0 LICOW合作的参数,控制在黑暗的部门的相互作用的强度的影响。我们发现一个峰对应于耦合$β> 0$和一个潜在的参数$α> 0$,或多或少明显取决于数据集的组合。我们分别显示了每个数据集的影响,并指出,它是特别是CMB透镜的一个数据集,最大的峰值向$Λ$ CDM。然而,当应用基于完整贝叶斯证据的模型选择标准时,由于CDE模型中引入了额外参数,因此在所有情况下仍首选$Λ$ CDM。

英文摘要:

In this work we provide updated constraints on coupled dark energy (CDE) cosmology with Peebles-Ratra (PR) potential and constant coupling strength $β$. This modified gravity scenario introduces a fifth force between dark matter particles, mediated by a scalar field that plays the role of dark energy. The mass of the dark matter particles does not remain constant, but changes with time as a function of the scalar field. Here we focus on the phenomenological behavior of the model, and assess its ability to describe updated cosmological data sets that include the Planck 2018 cosmic microwave background (CMB) temperature, polarization and lensing, baryon acoustic oscillations, the Pantheon compilation of supernovae of Type Ia, data on $H(z)$ from cosmic chronometers, and redshift-space distortions. We also study which is the impact of the local measurement of $H_0$ from SH0ES and the strong-lensing time delay data from the H0LICOW collaboration on the parameter that controls the strength of the interaction in the dark sector. We find a peak corresponding to a coupling $β> 0$ and to a potential parameter $α> 0$, more or less evident depending on the data set combination. We show separately the impact of each data set and remark that it is especially CMB lensing the one data set that shifts the peak the most towards $Λ$CDM. When a model selection criterion based on the full Bayesian evidence is applied, however, $Λ$CDM is still preferred in all cases, due to the additional parameters introduced in the CDE model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑