A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION

doi:http://dx.doi.org/10.3847/0004-637X/821/1/60

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	A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION
	Wang, S ; Hu, YZ ; Li, M; Li, N 1,3
刊名	ASTROPHYSICAL JOURNAL
	2016
卷号	821 期号:1 页码:60
关键词	cosmological parameters BARYON ACOUSTIC-OSCILLATIONS cosmology: observations DIGITAL SKY SURVEY dark energy PROBE WMAP OBSERVATIONS DATA RELEASE 9 SPECTROSCOPIC GALAXY SAMPLE DARK-ENERGY CONSTRAINTS LUMINOUS RED GALAXIES COSMOLOGICAL PARAMETERS SYSTEMATIC UNCERTAINTIES SUPERNOVA SAMPLE
DOI	http://dx.doi.org/10.3847/0004-637X/821/1/60
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.
学科主题	Astronomy & Astrophysics
语种	英语
资助机构	National Natural Science Foundation of China [11275247, 11335012, 11405024] ; 985 grant at Sun Yat-Sen University ; Fundamental Research Funds for the Central Universities [N130305007]
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23021]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China 2.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China 3.Sun Yat Sen Univ, Sch Astron & Space Sci, Guangzhou 510275, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	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.
APA	Wang, S,Hu, YZ,Li, M,&Li, N.(2016).A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION.ASTROPHYSICAL JOURNAL,821(1),60.
MLA	Wang, S,et al."A COMPREHENSIVE INVESTIGATION ON THE SLOWING DOWN OF COSMIC ACCELERATION".ASTROPHYSICAL JOURNAL 821.1(2016):60.