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题名: Direction dependence of the deceleration parameter
作者: Cai, RG ;  Tuo, ZL
刊名: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
出版日期: 2012
期号: 2, 页码:4
关键词: QUASAR POLARIZATION VECTORS ;  PROBE WMAP OBSERVATIONS ;  LUMINOUS RED GALAXIES ;  IA LIGHT CURVES ;  LAMBDA-CDM ;  HUBBLE DIAGRAM ;  SUPERNOVA DATA ;  COSMOLOGY ;  CONSTRAINTS ;  UNIVERSE
学科分类: Physics
通讯作者: Cai, RG (reprint author), Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
部门归属: [Cai, Rong-Gen; Tuo, Zhong-Liang] Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China
英文摘要: In this paper we study the possibly existing anisotropy in the accelerating expansion Universe by use of the full sample of Union2 data. Using the hemisphere comparison method to search for a preferred direction, we take the deceleration parameter q(0) as the diagnostic to quantify the anisotropy level in the wCDM model. We find that the maximum accelerating expansion direction is (l,b) = (314(+20 degrees)(degrees-13 degrees),(degrees-33 degrees)(+11 degrees)), with the maximum anisotropy level of Delta q(0,max)/(q) over bar (0) = 0.79(+0.27)(-0.28),and that the anisotropy is more prominent when only low redshift data (z <= 0.2) are used. We also discuss this issue in the CPL parameterized model, showing a similar result.
资助者: National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; 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:000301176000005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15168
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Cai, RG,Tuo, ZL. Direction dependence of the deceleration parameter[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2):4.
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