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arXiv 2409.02550astro-ph.CO
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星运多舛的劳作:检验当前超新星汇编之间的一致性

Star-Crossed Labours: Checking Consistency Between Current Supernovae Compilations

William L. Matthewson, Arman Shafieloo

AI总结:

本文用交叉统计和迭代平滑等模型无关方法检验 Union3、Pantheon+ 与 DES 5年超新星汇编的一致性,发现三者在零形变参数点附近仅约 2σ 一致,DES 分歧最大,但在扩展模型空间部分子集内仍可在 1-2σ 范围内兼容。

摘要:

我们利用与模型无关的统计方法来评估三种不同超新星汇编的一致性:Union3、Pantheon+ 和 DES 5年超新星。我们使用交叉统计(Crossing Statistics)扩展每个数据集的可用模型空间,并测试每个数据集与其他两个数据集的兼容性。具体做法是:(I)对某一特定数据集进行平坦 ΛCDM 拟合,以及(II)从某一特定数据集进行迭代平滑(Iterative Smoothing),并确定拟合其他两个数据集所需的形变程度。这使我们能够在标准模型内以及在某种扩展模型情形下检验各数据集的相互一致性,该扩展模型由特定数据集中存在的特征所激发。我们发现,在这两种情形下,数据仅在参数空间中对应零形变的点附近约 2σ 水平上一致,其中 DES 汇编表现出最大的不一致。然而,对于由形变所隐含的扩展模型空间的某些子集,所有三个数据集仍被发现在 1-2σ 范围内一致。

英文摘要:

We make use of model-independent statistical methods to assess the consistency of three different supernova compilations: Union3, Pantheon+ and DES 5-year supernovae. We expand the available model space of each, using Crossing Statistics, and test the compatibility of each dataset, against the other two. This is done using (I) a Flat $Λ$CDM fitting to, and (II) Iterative Smoothing from, one particular dataset, and determining the level of deformation by required to fit the other two. This allows us to test the mutual consistency of the datasets both within the standard model and in the case of some extended model, motivated by features present in a particular dataset. We find that, in both these cases, the data are only consistent with the point in the parameter space corresponding to zero deformation, at around a $2σ$ level, with the DES compilation showing the largest disagreement. However, all three datasets are still found to be consistent to within $1-2σ$ for some subset of the extended model space implied by the deformations.

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。

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