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Impact of a Locally Measured H0 on the Interpretation of Cosmic-chronometer Data
Wei,Jun-Jie1; Melia,Fulvio1,2; Wu,Xue-Feng1,3,4
2017-02-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume835Issue:2
AbstractAbstract Many measurements in cosmology depend on the use of integrated distances or time, but?galaxies evolving passively on a timescale much longer than their age difference allow us to determine the expansion rate H(z) solely as a function of the redshift–time derivative dz/dt. These model-independent “cosmic chronometers” can therefore be powerful discriminators for testing different cosmologies. In previous applications, the available sources strongly disfavored models (such as ΛCDM) predicting a variable acceleration, preferring instead a steady expansion rate over the redshift range 0???z???2. A more recent catalog of 30 objects appears to suggest non-steady expansion. In this paper, we show that such a result is entirely due to the inclusion of a high, locally inferred value of the Hubble constant H0 as an additional datum in a set of otherwise pure cosmic-chronometer measurements. This H0, however, is not the same as the background Hubble constant if the local expansion rate is influenced by a Hubble Bubble. Used on their own, the cosmic chronometers completely reverse this conclusion, favoring instead a constant expansion rate out to z?~?2.
Keywordcosmological parameters distance scale cosmology: observations cosmology: theory galaxies: evolution galaxies: general
DOI10.3847/1538-4357/835/2/270
Language英语
WOS IDIOP:0004-637X-835-2-270
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23759
Collection中国科学院紫金山天文台
Affiliation1.Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China; jjwei@pmo.ac.cn, fmelia@email.arizona.edu, xfwu@pmo.ac.cn
2.Department of Physics, The Applied Math Program?and Department of Astronomy, The University of Arizona, AZ 85721, USA
3.Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing University-Purple Mountain Observatory, Nanjing 210008, China
4.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, China
Recommended Citation
GB/T 7714
Wei,Jun-Jie,Melia,Fulvio,Wu,Xue-Feng. Impact of a Locally Measured H0 on the Interpretation of Cosmic-chronometer Data[J]. The Astrophysical Journal,2017,835(2).
APA Wei,Jun-Jie,Melia,Fulvio,&Wu,Xue-Feng.(2017).Impact of a Locally Measured H0 on the Interpretation of Cosmic-chronometer Data.The Astrophysical Journal,835(2).
MLA Wei,Jun-Jie,et al."Impact of a Locally Measured H0 on the Interpretation of Cosmic-chronometer Data".The Astrophysical Journal 835.2(2017).
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