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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
Source PublicationJOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Language英语
KeywordQuasar Polarization Vectors Probe Wmap Observations Luminous Red Galaxies Ia Light Curves Lambda-cdm Hubble Diagram Supernova Data Cosmology Constraints Universe
AbstractIn 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
Issue2Pages:4
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational 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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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/15168
Collection理论物理所科研产出_SCI论文
Corresponding AuthorCai, RG (reprint author), Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, POB 2735, Beijing 100190, Peoples R China.
Recommended Citation
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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