Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data
文献类型：期刊论文
| 作者 | Wei, Jun-Jie; Melia, Fulvio; Wu, Xue-Feng |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017 |
| 卷号 | 835期号:2页码:270- |
| 英文摘要 | 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 Lambda CDM) predicting a variable acceleration, preferring instead a steady expansion rate over the redshift range 0 less than or similar to z less than or similar to 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 H-0 as an additional datum in a set of otherwise pure cosmic-chronometer measurements. This H-0, 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 similar to 2. |
| 语种 | 英语 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/17422]  |
| 专题 | 中国科学院紫金山天文台 |
| 推荐引用方式 GB/T 7714 | Wei, Jun-Jie,Melia, Fulvio,Wu, Xue-Feng. Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data[J]. ASTROPHYSICAL JOURNAL,2017,835(2):270-. |
| APA | Wei, Jun-Jie,Melia, Fulvio,&Wu, Xue-Feng.(2017).Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data.ASTROPHYSICAL JOURNAL,835(2),270-. |
| MLA | Wei, Jun-Jie,et al."Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data".ASTROPHYSICAL JOURNAL 835.2(2017):270-. |
入库方式： OAI收割
来源：紫金山天文台
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