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Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data
Wei, Jun-Jie1; Melia, Fulvio1,2,3; Wu, Xue-Feng1,4,5
2017-02-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume835Issue:2Pages:6
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 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.

Keywordcosmological parameters distance scale cosmology: observations cosmology: theory galaxies: evolution galaxies: general
DOI10.3847/1538-4357/835/2/270
WOS KeywordIA SUPERNOVAE ; CT UNIVERSE ; R-H ; COSMOLOGICAL PARAMETERS ; HUBBLES CONSTANT ; RED GALAXIES ; LUMINOSITY ; BUBBLE ; H(Z) ; AGE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000401155400016
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23073
Collection中国科学院紫金山天文台
Corresponding AuthorWei, Jun-Jie
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing, 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.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210008, Peoples R China
5.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
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):6.
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),6.
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):6.
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