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题名: A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION
作者: Wang, S ;  Hu, YZ ;  Li, M ;  Li, N
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016
卷号: 821, 期号:1, 页码:60
关键词: cosmological parameters ;  cosmology: observations ;  dark energy
学科分类: Astronomy & Astrophysics
DOI: http://dx.doi.org/10.3847/0004-637X/821/1/60
通讯作者: Wang, S ;  Hu, YZ ;  Li, M ;  Li, N (reprint author), Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China. ;  Hu, YZ ;  Li, N (reprint author), Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China. ;  Hu, YZ ;  Li, N (reprint author), Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China.
文章类型: Article
英文摘要: Shafieloo et al. first proposed the possibility that the current cosmic acceleration (CA) is slowing down. However, this is rather counterintuitive because a slowing down CA cannot be accommodated in most mainstream cosmological models. In this work, by exploring the evolutionary trajectories of the dark energy equation of state w (z) and deceleration parameter q(z), we present a comprehensive investigation on the slowing down of CA from both the theoretical and the observational sides. For the theoretical side, we study the impact of different w(z) using six parametrization models, and then we discuss the effects of spatial curvature. For the observational side, we investigate the effects of different type Ia supernovae (SNe Ia), baryon acoustic oscillation (BAO), and cosmic microwave background (CMB) data. We find that (1) the evolution of CA is insensitive to the specific form of w(z); in contrast, a non-flat universe favors a slowing down CA more than a flat universe. (2) SNLS3 SNe Ia data sets favor a slowing down CA at a 1 sigma confidence level, while JLA SNe Ia samples prefer an eternal CA; in contrast, the effects of different BAO data are negligible. (3) Compared with CMB distance prior data, full CMB data favor a slowing down CA more. (4) Due to the low significance, the slowing down of CA is still a theoretical possibility that cannot be confirmed by the current observations.
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: BARYON ACOUSTIC-OSCILLATIONS ;  DIGITAL SKY SURVEY ;  PROBE WMAP OBSERVATIONS ;  DATA RELEASE 9 ;  SPECTROSCOPIC GALAXY SAMPLE ;  DARK-ENERGY CONSTRAINTS ;  LUMINOUS RED GALAXIES ;  COSMOLOGICAL PARAMETERS ;  SYSTEMATIC UNCERTAINTIES ;  SUPERNOVA SAMPLE
收录类别: SCI
项目资助者: National Natural Science Foundation of China [11275247, 11335012, 11405024] ;  985 grant at Sun Yat-Sen University ;  Fundamental Research Funds for the Central Universities [N130305007]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21697
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
Wang, S,Hu, YZ,Li, M,et al. A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION[J]. ASTROPHYSICAL JOURNAL,2016,821(1):60.
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