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    Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data

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    Wei_2017_ApJ_835_270.pdf
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    Author
    Wei, Jun-Jie cc
    Melia, Fulvio cc
    Wu, Xue-Feng cc
    Affiliation
    Univ Arizona, Dept Phys, Program Appl Math
    Issue Date
    2017-02-01
    Keywords
    cosmological parameters
    distance scale
    cosmology: observations
    cosmology: theory
    galaxies: evolution
    galaxies: general
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Impact of a Locally Measured H-0 on the Interpretation of Cosmic-chronometer Data 2017, 835 (2):270 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2017. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    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.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/835/2/270
    Version
    Final published version
    Sponsors
    National Basic Research Program ("973" Program) of China [2014CB845800]; National Natural Science Foundation of China [11322328, 11433009, 11673068, 11603076]; Youth Innovation Promotion Association [2011231, 2017366]; Key Research Program of Frontier Sciences [QYZDB-SSW-SYS005]; Strategic Priority Research Program "Multi-waveband gravitational wave Universe" of the Chinese Academy of Sciences [XDB23000000]; Natural Science Foundation of Jiangsu Province [BK20161096]; Chinese Academy of Sciences Visiting Professorships [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]
    Additional Links
    http://stacks.iop.org/0004-637X/835/i=2/a=270?key=crossref.eb9080ce27df1890718403638d7397de
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/835/2/270
    Scopus Count
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    UA Faculty Publications

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