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题名: Constraining the anisotropic expansion of the Universe
作者: Cai, RG ;  Ma, YZ ;  Tang, B ;  Tuo, ZL
刊名: PHYSICAL REVIEW D
出版日期: 2013
卷号: 87, 期号:12, 页码:123522
关键词: PROBE WMAP OBSERVATIONS ;  HUBBLE DIAGRAM ;  SUPERNOVA ;  COSMOLOGY
学科分类: Physics
通讯作者: Cai, RG (reprint author), Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
部门归属: [Cai, Rong-Gen; Tuo, Zhong-Liang] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China; [Ma, Yin-Zhe] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada; [Ma, Yin-Zhe] Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada
英文摘要: We study the possibly existing anisotropy in the accelerating expansion Universe with the Union2 type Ia supernovae data and gamma-ray burst data. We construct a direction-dependent dark energy model and constrain the anisotropy direction and strength of modulation. We find that the maximum anisotropic deviation direction is (l, b) = (126 degrees, 13 degrees) [or, equivalently, (l, b) = (306 degrees, -13 degrees)], and the current anisotropy level is g(0) = 0.030(+0.010)(-0.030) (1 sigma confidence level with Union2 data). Our results do not show strong evidence for the anisotropic dark energy model. We also discuss potential methods that may distinguish the peculiar velocity field from the anisotropic dark energy model.
资助者: National Natural Science Foundation of China [10821504, 10975168, 11035008]; Ministry of Science and Technology of China [2010CB833004]; John Templeton Foundation; National Astronomical Observatories of Chinese Academy of Sciences
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000320770300001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15344
Appears in Collections:理论物理所2013年知识产出 _期刊论文

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Recommended Citation:
Cai, RG,Ma, YZ,Tang, B,et al. Constraining the anisotropic expansion of the Universe[J]. PHYSICAL REVIEW D,2013,87(12):123522.
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