Impact of a Locally Measured H0 on the Interpretation of Cosmic-chronometer Data
文献类型：期刊论文
| 作者 | Wei,Jun-Jie1; Melia,Fulvio1,2; Wu,Xue-Feng1,3,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-02-01 |
| 卷号 | 835期号:2 |
| 关键词 | cosmological parameters distance scale cosmology: observations cosmology: theory galaxies: evolution galaxies: general |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/835/2/270 |
| 英文摘要 | Abstract 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. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-835-2-270 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/23758]  |
| 专题 | 中国科学院紫金山天文台 |
| 作者单位 | 1.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 |
| 推荐引用方式 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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