Preferred axis of CMB parity asymmetry in the masked maps

doi:http://dx.doi.org/10.1016/j.physletb.2016.04.030

CORC > 理论物理研究所 > 中国科学院理论物理研究所 > 理论物理所科研产出 > 理论物理所1978-2010年知识产出

	Preferred axis of CMB parity asymmetry in the masked maps
	Cheng, C ; Zhao, W 1; Huang, QG; Santos, L 1
刊名	PHYSICS LETTERS B
	2016
卷号	757 页码:445-453
关键词	MICROWAVE-ANISOTROPY-PROBE QUASAR POLARIZATION VECTORS HEMISPHERICAL POWER ASYMMETRY BACKGROUND ANISOTROPY WMAP OBSERVATIONS COHERENT ORIENTATIONS ANGULAR-DISTRIBUTION SPECTRUM ESTIMATION GABOR TRANSFORMS NON-GAUSSIANITY
DOI	http://dx.doi.org/10.1016/j.physletb.2016.04.030
英文摘要	Both WMAP and Planck data show a significant odd-multipole preference in the large scales of the cosmic microwave background (CMB) temperature anisotropies. If this pattern originates from cosmological effects, then it can be considered a crucial clue for a violation in the cosmological principle. By defining various direction dependent statistics in the full-sky Planck 2015 maps (see, for instance, Naselsky et al. (2012); W. Zhao (2014)), we found that the CMB parity asymmetry has a preferred direction, which is independent of the choices of the statistics. In particular, this preferred axis is strongly aligned with those in the CMB quadrupole and octopole, as well as that in the CMB kinematic dipole, which hints to their non-cosmological origin. In realistic observations, the foreground residuals are inevitable, and should be properly masked out in order to avoid possible misinterpretation of the results. In this paper, we extend our previous analyses to the masked Planck 2015 data. By defining a similar direction dependent statistic in the masked map, we find a preferred direction of the CMB parity asymmetry, in which the axis also coincides with that found in the full-sky analysis. Therefore, our conclusions on the CMB parity violation and its directional properties are confirmed. (C) 2016 The Authors. Published by Elsevier B.V.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
资助机构	Project 973 [2012CB821804] ; NSFC [11173021, 11322324, 11421303, 11322545, 11335012, 11575271, 11447613] ; Chinese Academy of Science ; Top-Notch Young Talents Program of China
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23259]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China 2.Univ Sci & Technol China, Chinese Acad Sci, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Cheng, C,Zhao, W,Huang, QG,et al. Preferred axis of CMB parity asymmetry in the masked maps[J]. PHYSICS LETTERS B,2016,757:445-453.
APA	Cheng, C,Zhao, W,Huang, QG,&Santos, L.(2016).Preferred axis of CMB parity asymmetry in the masked maps.PHYSICS LETTERS B,757,445-453.
MLA	Cheng, C,et al."Preferred axis of CMB parity asymmetry in the masked maps".PHYSICS LETTERS B 757(2016):445-453.