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题名: A COMPARATIVE ANALYSIS OF THE SUPERNOVA LEGACY SURVEY SAMPLE WITH Lambda CDM AND THE R-h = ct UNIVERSE
作者: Wei, Jun-Jie1, 4; Wu XueFeng(吴雪峰)1, 5, 6; Melia, Fulvio1, 2, 3; Maier, Robert S.7, 8
刊名: ASTRONOMICAL JOURNAL
出版日期: 2015-03-01
卷号: 149, 期号:3, 页码:102
关键词: cosmic background radiation ; cosmological parameters ; cosmology: observations ; cosmology: theory ; distance scale ; supernovae: general
学科分类: 天文和天体物理
DOI: 10.1088/0004-6256/149/3/102
文章类型: Article
英文摘要: The use of Type Ia supernovae (SNe Ia) has thus far produced the most reliable measurement of the expansion history of the universe, suggesting that Lambda CDM offers the best explanation for the redshift-luminosity distribution observed in these events. However, analysis of other kinds of sources, such as cosmic chronometers, gamma-ray bursts, and high-z quasars, conflicts with this conclusion, indicating instead that the constant expansion rate implied by the R-h = ct universe is a better fit to the data. The central difficulty with the use of SNe Ia as standard candles is that one must optimize three or four nuisance parameters characterizing supernova (SN) luminosities simultaneously with the parameters of an expansion model. Hence, in comparing competing models, one must reduce the data independently for each. We carry out such a comparison of Lambda CDM and the R-h = ct universe using the SN Legacy Survey sample of 252 SN events, and show that each model fits its individually reduced data very well. However, since R-h = ct has only one free parameter (the Hubble constant), it follows from a standard model selection technique that it is to be preferred over Lambda CDM, the minimalist version of which has three (the Hubble constant, the scaled matter density, and either the spatial curvature constant or the dark energy equation-of-state parameter). We estimate using the Bayes Information Criterion that in a pairwise comparison, the likelihood of R-h = ct is similar to 90%, compared with only similar to 10% for a minimalist form of Lambda CDM, in which dark energy is simply a cosmological constant. Compared to R-h = ct, versions of the standard model with more elaborate parametrizations of dark energy are judged to be even less likely.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: HUBBLE-SPACE-TELESCOPE ; GAMMA-RAY BURSTS ; SUPERMASSIVE BLACK-HOLES ; EQUATION-OF-STATE ; IA SUPERNOVAE ; COSMOLOGICAL PARAMETERS ; COSMIC CHRONOMETERS ; GALAXY CLUSTERS ; PEAK LUMINOSITY ; REDSHIFT 6
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000352304000013
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14889
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Univ Arizona, Dept Phys, Program Appl Math, Tucson, AZ 85721 USA
3.Univ Arizona, Dept Astron, Tucson, AZ 85721 USA
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Chinese Ctr Antarctic Astron, Nanjing 210008, Jiangsu, Peoples R China
6.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Jiangsu, Peoples R China
7.Univ Arizona, Dept Math, Stat Program, Tucson, AZ 85721 USA
8.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
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