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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
Source PublicationPHYSICAL REVIEW D
Corresponding Author[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
AbstractIn 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.
Subject AreaAstronomy & Astrophysics; Physics
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000260574900045
ADS Bibcode2008PhRvD..78h3524X
ADS URLhttps://ui.adsabs.harvard.edu/abs/2008PhRvD..78h3524X
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2008PhRvD..78h3524X/citations
Citation statistics
Cited Times:51 [INSPIRE]
Cited Times:54 [ADS]
Document Type期刊论文
First Author AffilicationInstitute of High Energy
Recommended Citation
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.
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