Anisotropic power spectrum and the observed low-l power in PLANCK CMB data

被引：5
|
作者：
Chang, Zhe [1 ,2 ]
Rath, Pranati K. [1 ,3 ]
Sang, Yu [1 ,2 ]
Zhao, Dong [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2018年 / 18卷 / 03期
基金：
中国国家自然科学基金;
关键词：
cosmic background radiation; large-scale structure of universe; FINE-STRUCTURE CONSTANT; PROBE WMAP OBSERVATIONS; SPECIAL RELATIVITY; COLD SPOT; MICROWAVE; PARITY; ASYMMETRY; SYMMETRY; CONSTRAINTS; ALIGNMENTS;
D O I：
10.1088/1674-4527/18/3/29
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
In this work, we study a direction dependent power spectrum in anisotropic Finsler space-time. We use this direction dependent power spectrum to address the low-l power observed in WMAP and PLANCK data. The angular power spectrum of the temperature fluctuations has a lower amplitude in comparison to the Lambda CDM model in the multipole range l = 2 - 40. Our theoretical model gives a correction to the isotropic angular power spectrum C-l(TT) due to the breaking of rotational invariance of the primordial power spectrum. We estimate best-fit model parameters along with the six Lambda CDM cosmological parameters using the PLANCK likelihood code in CosmoMC software. We find that this modified angular power spectrum fits the CMB temperature data in the multipole range l = 2 - 10 to a good extent but fails for the whole multipole range l = 2 - 40.
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页数：10
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