AI 中文总结
利用多种晚期数据集，通过马尔可夫链蒙特卡罗分析约束$\xi$IDE模型参数，发现该模型使哈勃张力降低但未完全解决。当前数据仅微弱暗示暗区相互作用非零，但贝叶斯证据更支持$\Lambda$CDM模型。
AI 中文摘要
在这项工作中，我们使用来自DESI数据发布1和数据发布2的重子声学振荡测量值，结合宇宙计时器测量值、压缩的CMB似然性以及三种不同的Ia型超新星汇编（Pantheon$^+$、DES - Dovekie和Union3），来约束唯象相互作用暗能量$\xi$IDE模型。我们使用马尔可夫链蒙特卡罗分析，通过宇宙学推断代码\texttt{SimpleMC}，利用\texttt{dynesty}包中实现的嵌套采样算法来约束$\xi$IDE模型的参数。与$\Lambda$CDM相比，$\xi$IDE模型倾向于稍高的哈勃常数，导致哈勃张力降低，但任何数据集组合都未完全解决该张力。参数$\xi$始终被约束在接近其$\Lambda$CDM预测的值，表明与标准宇宙学情景无统计学上的显著偏差。除了CMB + DESI DR1 + CC数据集组合外，暗能量状态方程参数倾向于$w_{\rm X} > -1$的值，显示出对类 Quintessence行为的偏好并为动态暗能量提供了证据。相互作用参数组合$\xi + 3w_{\rm X}$在所有数据集组合中均为负，对应于从暗能量到暗物质的能量转移。对于CMB + DESI DR2 + CC + Union3数据集组合获得了最强偏好，产生$\xi + 3w_{\rm X} = -0.035 \pm 0.023$，仅偏离非相互作用极限$1.52\sigma$。因此，当前数据仅提供了暗区相互作用非零的微弱迹象。基于$N\sigma$统计的模型比较显示出支持相互作用情景的微弱证据，而贝叶斯证据始终倾向于$\Lambda$CDM模型。
英文摘要
In this work, we constrain the phenomenological interacting dark energy $ξ$IDE model using baryon acoustic oscillation measurements from DESI Data Release 1 and Data Release 2, combined with cosmic chronometer measurements, compressed CMB likelihoods, and three different Type Ia supernova compilations: Pantheon$^+$, DES-Dovekie, and Union3. We constrain the parameters of the $ξ$IDE model using a Markov Chain Monte Carlo analysis, using the nested sampling algorithm implemented in the \texttt{dynesty} package through the cosmological inference code \texttt{SimpleMC}. Compared to $Λ$CDM, the $ξ$IDE model favors slightly higher values of the Hubble constant, leading to a reduction in the Hubble tension. However, the tension is not completely resolved for any dataset combination. The parameter $ξ$ is consistently constrained to values close to its $Λ$CDM prediction, indicating no statistically significant deviation from the standard cosmological scenario. Similarly, except for the CMB + DESI DR1 + CC dataset combination, the dark energy equation-of-state parameter prefers values of $w_{\rm X}>-1$, showing a preference for quintessence-like behavior and providing evidence for dynamical dark energy. The interaction parameter combination, $ξ+3w_{\rm X}$, is found to be negative for all dataset combinations, corresponding to energy transfer from dark energy to dark matter. The strongest preference is obtained for the CMB + DESI DR2 + CC + Union3 dataset combination, yielding $ξ+3w_{\rm X}=-0.035\pm0.023$, which corresponds to a deviation of only $1.52σ$ from the non-interacting limit. Therefore, the current data provide only a weak indication of a non-zero dark-sector interaction. Model comparison based on the $Nσ$ statistic shows weak evidence in favor of the interacting scenario, while Bayesian evidence consistently prefers the $Λ$CDM model.
Commentsv1: 11 pages, two-column style
