Determining cosmological parameters with the latest observational data

	Determining cosmological parameters with the latest observational data
	Xia JQ(夏俊卿); Zhang XM(张新民); Xia, JQ; Li, H; Zhao, GB; Zhang, XM
刊名	PHYSICAL REVIEW D
	2008
卷号	78 期号:8 页码:83524
通讯作者	[Xia, Jun-Qing ; Zhang, Xinmin] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Xia, Jun-Qing] Scuola Int Super Studi Avanzati, I-34014 Trieste, Italy ; [Li, Hong] Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China ; [Xia, Jun-Qing ; Li, Hong ; Zhang, Xinmin] Chinese Acad Sci, TPCSF, Beijing 100864, Peoples R China ; [Zhao, Gong-Bo] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada
英文摘要	In this paper, we combine the latest observational data, including the WMAP five-year data (WMAP5), BOOMERanG, CBI, VSA, ACBAR, as well as the baryon acoustic oscillations (BAO) and type Ia supernovae (SN) "union" compilation (307 sample), and use the Markov Chain Monte Carlo method to determine the cosmological parameters, such as the equation of state (EoS) of dark energy, the curvature of the universe, the total neutrino mass, and the parameters associated with the power spectrum of primordial fluctuations. In a flat universe, we obtain the tight limit on the constant EoS of dark energy as w=-0.977 +/- 0.056(stat)+/- 0.057(sys). For the dynamical dark energy models with the time evolving EoS parametrized as w(de)(a)=w(0)+w(1)(1-a), we find that the best-fit values are w(0)=-1.08 and w(1)=0.368, while the Lambda CDM model remains a good fit to the current data. For the curvature of the universe Omega(k), our results give -0.012 = 1 are excluded at more than 2 sigma confidence level. However, in the framework of dynamical dark energy models, the allowed region in the parameter space of (n(s),r) is enlarged significantly. Finally, we find no strong evidence for the large running of the spectral index.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
研究领域[WOS]	Astronomy & Astrophysics ; Physics
原文出处	SCI
语种	英语
WOS记录号	WOS:000260574900045
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/240821]
专题	高能物理研究所_理论物理室高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Xia JQ,Zhang XM,Xia, JQ,et al. Determining cosmological parameters with the latest observational data[J]. PHYSICAL REVIEW D,2008,78(8):83524.
APA	夏俊卿,张新民,Xia, JQ,Li, H,Zhao, GB,&Zhang, XM.(2008).Determining cosmological parameters with the latest observational data.PHYSICAL REVIEW D,78(8),83524.
MLA	夏俊卿,et al."Determining cosmological parameters with the latest observational data".PHYSICAL REVIEW D 78.8(2008):83524.