论文标题
通过黑暗能源调查和普朗克数据评估张力指标
Assessing tension metrics with Dark Energy Survey and Planck data
论文作者
论文摘要
量化紧张局势 - 通过不同的实验测量宇宙学参数的不一致 - 已成为现代宇宙数据分析的关键部分。两个实验或宇宙学探针之间的统计学上很重要的紧张局势可能表明新物理学延伸超出了标准宇宙学模型，需要及时确定。我们将文献中提出的几个张力估计量应用于深色能源调查（DES）大规模结构测量和Planck Cosmic微波背景数据。我们首先使用合成DES数据评估这些指标对两者之间人为引入的输入张力的响应性。然后，我们将指标应用于Planck和实际DES 1年数据的比较。我们发现，参数差异，特征性和可疑性指标都在模拟和真实数据上都产生相似的结果，而贝叶斯的比率由于其对先前体积的依赖而与其余的不一致。使用这些指标，我们计算了DES 1 $ 3 \ times 2 $ pt和Planck之间的张力，发现调查在$ \ sim2.3σ$张力下的$λ$ CDM Paradigm。这套指标提供了一个工具集，用于在DES 3年代及以后的DES数据及以后进行稳健测试紧张局势。
Quantifying tensions -- inconsistencies amongst measurements of cosmological parameters by different experiments -- has emerged as a crucial part of modern cosmological data analysis. Statistically-significant tensions between two experiments or cosmological probes may indicate new physics extending beyond the standard cosmological model and need to be promptly identified. We apply several tension estimators proposed in the literature to the Dark Energy Survey (DES) large-scale structure measurement and Planck cosmic microwave background data. We first evaluate the responsiveness of these metrics to an input tension artificially introduced between the two, using synthetic DES data. We then apply the metrics to the comparison of Planck and actual DES Year 1 data. We find that the parameter differences, Eigentension, and Suspiciousness metrics all yield similar results on both simulated and real data, while the Bayes ratio is inconsistent with the rest due to its dependence on the prior volume. Using these metrics, we calculate the tension between DES Year 1 $3\times 2$pt and Planck, finding the surveys to be in $\sim 2.3σ$ tension under the $Λ$CDM paradigm. This suite of metrics provides a toolset for robustly testing tensions in the DES Year 3 data and beyond.
