The cut-sky cosmic microwave background is not anomalous

The cut-sky cosmic microwave background is not anomalous
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切空宇宙微波背景并非异常

DOI:
10.1103/physrevd.81.103008
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发表时间:
2010
期刊:
影响因子:
5
通讯作者:
Pontzen A
Pontzen A
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Pontzen A

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此前曾有报道称,观测到的宇宙微波背景角相关函数是异常的,特别是在未受银河发射污染的天空区域进行测量时。 Efstathiouet 等人最近的工作提出了各向同性理论的贝叶斯比较,对所谓的异常现象的重要性提出了质疑。我们将此分析扩展到所有具有消失均值 () 的各向异性高斯理论,使用更广泛的模型类别来确认该异常不太可能指向新的物理学。另一方面,如果有任何新的物理现象需要收集,那么它是低对准的结果,这将通过全天空统计数据更好地量化。我们还考虑假设各向同性构建的二次最大似然功率谱估计器。因此,如果系综是各向异性的,则基本假设是错误的。尽管如此,我们证明,对于与观测到的天空兼容的理论,这些估计器(虽然不再是最优的)在统计上仍然优于伪功率谱估计器。
The observed angular correlation function of the cosmic microwave background has previously been reported to be anomalous, particularly when measured in regions of the sky uncontaminated by Galactic emission. Recent work by Efstathiouet al.presents a Bayesian comparison of isotropic theories, casting doubt on the significance of the purported anomaly. We extend this analysis to all anisotropic Gaussian theories with vanishing mean (), using the much wider class of models to confirm that the anomaly is not likely to point to new physics. On the other hand if there is any new physics to be gleaned, it results from low-alignments which will be better quantified by a full-sky statistic. We also consider quadratic maximum likelihood power spectrum estimators that are constructed assuming isotropy. The underlying assumptions are therefore false if the ensemble is anisotropic. Nonetheless we demonstrate that, for theories compatible with the observed sky, these estimators (while no longer optimal) remain statistically superior to pseudo-power spectrum estimators.
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