Direction dependence of the deceleration parameter

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	Direction dependence of the deceleration parameter
	Cai, RG ; Tuo, ZL
刊名	JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
	2012
期号	2
关键词	QUASAR POLARIZATION VECTORS PROBE WMAP OBSERVATIONS LUMINOUS RED GALAXIES IA LIGHT CURVES LAMBDA-CDM HUBBLE DIAGRAM SUPERNOVA DATA COSMOLOGY CONSTRAINTS UNIVERSE
ISSN号	1475-7516
通讯作者	Cai, RG: Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
中文摘要	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.
收录类别	SCI
资助信息	National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/36096]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Cai, RG,Tuo, ZL. Direction dependence of the deceleration parameter[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2).
APA	Cai, RG,&Tuo, ZL.(2012).Direction dependence of the deceleration parameter.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2).
MLA	Cai, RG,et al."Direction dependence of the deceleration parameter".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2012).