arXiv 2001.037752020-01astro-ph.CO

各向异性宇宙中相互作用的暗扇区：观测约束和$H_{0}$张力

Interacting Dark Sectors in Anisotropic Universe: Observational Constraints and $H_{0}$ Tension

Hassan Amirhashchi, Anil Kumar Yadav, Nafis Ahmad, Vikrant Yadav

备注：: 11 pages, 21 figures
发表信息：: Physics of the Dark Universe, 36 (2022) 101043

摘要：

本研究揭示了各向异性Bianchi I型宇宙暗分量之间耦合的观测约束。我们假设暗物质和暗能量之间的相互作用，并分裂的连续性方程，包括相互作用项$Γ$。已经考虑了两种情况（i）当暗分量之间的耦合是恒定的和（ii）当它是红移（$z$）的函数。利用宇宙测时（CC）技术、宇宙微波背景（CMB）重子声振荡（BAO）、Ia型超新星的Pantheon汇编（SNIa）、它们的联合组合以及哈勃参数$H_{0}$的高斯先验，对哈勃观测数据进行了Metropolis-Hasting算法的蒙特卡罗马尔可夫链（MCMC）分析。结果表明，在68%的置信水平下，所有数据库的组合加上在当前暗能量密度上被边缘化的$H_{0}$先验对当前耦合值给出了严格的约束，即在恒定耦合模型中为$-0.001<δ<0.041$，在变化耦合模型中为$-0.042<δ<0.053$.一般来说，对于这两个模型，我们发现$ω^{X}\approx -1$和$δ(δ_{0})\approx 0$，这表明最近的数据仍然有利于非耦合$Λ$ CDM模型。我们的估计表明，在常数耦合模型$(H_{0}=73.9^{+1.5}_{-0.95}, δ=0.023^{+0.017}_{-0.024})$，这自然会导致一致的哈勃常数的值。这个结果很有趣，因为之前的工作表明，如此高的哈勃常数值需要耦合参数$δ$的显着值。在常数耦合模型中，我们发现估算的$H_{0}$与哈勃空间望远镜（HST）和大尺度结构（LSS）实验的结果没有任何差异。

英文摘要：

The present study reveals observational constraints on the coupling between dark components of anisotropic Bianchi type I universe. We assume interaction between dark matter and dark energy and split the continuity equation with inclusion of interaction term $Γ$. Two scenarios have been considered (i) when coupling between dark components is constant and (ii) when it is a function of redshift ($z$). Metropolis-Hasting algorithm has been used to perform Monte Carlo Markov Chain (MCMC) analysis by using observational Hubble data obtained from cosmic chronometric (CC) technique, cosmic microwave background (CMB) baryon acoustic oscillation (BAO), Pantheon compilation of Supernovae type Ia (SNIa), their joint combination and a Gaussian prior on the Hubble parameter $H_{0}$. It is obtained that the combination of all databases plus $H_{0}$ prior marginalized over a present dark energy density gives stringent constraints on the current value of coupling as $-0.001<δ<0.041$ in constant coupling model and $-0.042<δ<0.053$ in varying coupling model at 68\% confident level. In general, for both models, we found $ω^{X}\approx -1$ and $δ(δ_{0})\approx 0$ which indicate that still recent data favor uncoupled $Λ$CDM model. Our estimations show that in constant coupling model $(H_{0}=73.9^{+1.5}_{-0.95}, δ=0.023^{+0.017}_{-0.024})$ which naturally leads to consistent value of the Hubble constant. This result is interesting because the previous works show that such a high value of Hubble constant requires the significant value of coupling parameter $δ$. It has been also observed that in the constant coupling model, we do not find any disagreement between the estimated $H_{0}$ and those reported by Hubble space telescope (HST) and large scale structure (LSS) experiments.

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