ITP OpenIR  > 2012年知识产出
Direction dependence of the deceleration parameter
Cai, RG; Tuo, ZL; Cai, RG (reprint author), Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
2012
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
ISSN1475-7516
期号2页码:4
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.
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
关键词Quasar Polarization Vectors Probe Wmap Observations Luminous Red Galaxies Ia Light Curves Lambda-cdm Hubble Diagram Supernova Data Cosmology Constraints Universe
学科领域Physics
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 ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
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收录类别SCI
语种英语
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 ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences ; National Natural Science Foundation of China [10821504, 10975168, 11035008, 11075098]; Ministry of Science and Technology of China [2010CB833004]; Chinese Academy of Sciences
WOS记录号WOS:000301176000005
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被引频次:24[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15168
专题2012年知识产出
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.
推荐引用方式
GB/T 7714
Cai, RG,Tuo, ZL,Cai, RG . Direction dependence of the deceleration parameter[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2):4.
APA Cai, RG,Tuo, ZL,&Cai, RG .(2012).Direction dependence of the deceleration parameter.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2),4.
MLA Cai, RG,et al."Direction dependence of the deceleration parameter".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2012):4.
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