A new measure of tension between experiments
A new measure of tension between experiments
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实验间紧张度的新衡量标准
DOI：
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发表时间：
2018
影响因子：
6.4
通讯作者：
D. Huterer
中科院分区：
文献类型：
--
作者：
S. Adhikari;D. Huterer
通过不同的调查或探测器进行的宇宙学测量之间的紧张关系一直是重要的--目前讨论得很多--因为它们可能导致新物理的证据。已经设计了几种测试来探索给定的宇宙学模型的数据集的一致性，但它们通常具有不受欢迎的特征，如对先前体积的依赖，或繁重的要求，如近高斯后验分布。我们提出了一个新的量，以类似于贝叶斯证据比率的方式定义，其中不存在这些不希望看到的属性。我们在具有高斯和非高斯似然的简单模型上测试了该数量。然后我们将其应用于普朗克卫星的数据：我们研究了从TT和EE角功率谱测量获得的Λ清洁发展机制模型参数的一致性，以及从每次测量的大尺度(多极，ℓ<；1000)和小尺度(ℓ⩾1000)获得的宇宙学参数的相互一致性，发现在六维Λ清洁发展机制参数空间中没有显著差异。
Tensions between cosmological measurements by different surveys or probes have always been important —and are presently much discussed —as they may lead to evidence of new physics. Several tests have been devised to probe the consistency of datasets given a cosmological model, but they often have undesired features such as dependence on the prior volume, or burdensome requirements such as that of near-Gaussian posterior distributions. We propose a new quantity, defined in a similar way as the Bayesian evidence ratio, in which these undesired properties are absent. We test the quantity on simple models with Gaussian and non-Gaussian likelihoods. We then apply it to data from the Planck satellite: we investigate the consistency of ΛCDM model parameters obtained from TT and EE angular power spectrum measurements, as well as the mutual consistency of cosmological parameters obtained from large scale (multipoles, ℓ<1000) and small scale (ℓ ⩾ 1000) portions of each measurement and find no significant discrepancy in the six-dimensional ΛCDM parameter space.
影响因子：
4.8
作者：
H. Hildebrandt;M. Viola;C. Heymans;S. Joudaki;K. Kuijken;C. Blake;T. Erben;B. Joachimi;D. Klaes
通讯作者：
H. Hildebrandt;M. Viola;C. Heymans;S. Joudaki;K. Kuijken;C. Blake;T. Erben;B. Joachimi;D. Klaes
影响因子：
4.8
作者：
S. Joudaki;C. Blake;C. Heymans;A. Choi;J. Harnois-Déraps;H. Hildebrandt;B. Joachimi;Andrew Johnson-Andrew-Jo
通讯作者：
S. Joudaki;C. Blake;C. Heymans;A. Choi;J. Harnois-Déraps;H. Hildebrandt;B. Joachimi;Andrew Johnson-Andrew-Jo