Direction dependence of the deceleration parameter | |
Cai, RG | |
刊名 | JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS |
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 |
ISSN号 | 1475-7516 |
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. |
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. |
学科主题 | Physics |
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 |
原文出处 | http://dx.doi.org/10.1088/1475-7516/2012/02/004 |
语种 | 英语 |
WOS记录号 | WOS:000301176000005 |
公开日期 | 2014-04-25 |
内容类型 | 期刊论文 |
源URL | [http://ir.itp.ac.cn/handle/311006/15168] |
专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
推荐引用方式 GB/T 7714 | Cai, RG. Direction dependence of the deceleration parameter[J]. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS,2012(2):4. |
APA | Cai, RG.(2012).Direction dependence of the deceleration parameter.JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(2),4. |
MLA | Cai, RG."Direction dependence of the deceleration parameter".JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS .2(2012):4. |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论