Alignments of parity even/odd-only multipoles in CMB

被引：21
作者：
Aluri, Pavan K. [1 ]
Ralston, John P. [2 ]
Weltman, Amanda [1 ,3 ,4 ]
机构：
[1] Univ Cape Town, Cosmol & Grav Grp, Dept Math & Appl Math, ZA-7700 Rondebosch, South Africa
[2] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[3] Inst Adv Study, Princeton, NJ 08540 USA
[4] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 472卷 / 02期
基金：
新加坡国家研究基金会;
关键词：
methods: data analysis; cosmic background radiation; submillimetre: diffuse background; MICROWAVE-ANISOTROPY-PROBE; GAUSSIAN COLD SPOT; POWER ASYMMETRY; WMAP DATA; SKY; RADIATION; ANOMALIES; ISOTROPY;
D O I：
10.1093/mnras/stx2112
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We compare the statistics of parity even and odd multipoles of the cosmic microwave background (CMB) sky from Planck full mission temperature measurements. An excess power in odd multipoles compared to even multipoles has previously been found on large angular scales. Motivated by this apparent parity asymmetry, we evaluate directional statistics associated with even compared to odd multipoles, along with their significances. Primary tools are the Power tensor and Alignment tensor statistics. We limit our analysis to the first 60 multipoles i.e. l = [ 2, 61]. We find no evidence for statistically unusual alignments of even parity multipoles. More than one independent statistic finds evidence for alignments of anisotropy axes of odd multipoles, with a significance equivalent to similar to 2 sigma or more. The robustness of alignment axes is tested by making Galactic cuts and varying the multipole range. Very interestingly, the region spanned by the (a) symmetry axes is found to broadly contain other parity (a) symmetry axes previously observed in the literature.
引用
收藏
页码：2410 / 2421
页数：12
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