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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.
Direction dependence of the deceleration parameter
发表期刊JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
语种英语
关键词Quasar Polarization Vectors Probe Wmap Observations Luminous Red Galaxies Ia Light Curves Lambda-cdm Hubble Diagram Supernova Data Cosmology Constraints Universe
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.
2012
ISSN1475-7516
期号2页码:4
学科领域Physics
收录类别SCI
项目资助者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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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/15168
专题理论物理所科研产出_SCI论文
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.
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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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