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    Concordance cosmology?

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    Author
    Park, Youngsoo
    Rozo, Eduardo
    Affiliation
    Department of Physics, University of Arizona
    Issue Date
    2020-09-01
    Keywords
    cosmological parameters
    early Universe
    large-scale structure of the Universe
    
    Metadata
    Show full item record
    Publisher
    Oxford University Press
    Citation
    Park, Y., & Rozo, E. (2020). Concordance cosmology?. Monthly Notices of the Royal Astronomical Society, 499(4), 4638-4645.
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    © 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
    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
    We propose a new intuitive metric for evaluating the tension between two experiments, and apply it to several data sets. While our metric is non-optimal, if evidence of tension is detected, this evidence is robust and easy to interpret. Assuming a flat Lambda cold dark matter (ΛCDM) cosmological model, we find that there is a modest 2.2σ tension between the Dark Energy Survey (DES) Year 1 results and the Planck measurements of the cosmic microwave background. This tension is driven by the difference between the amount of structure observed in the late-time Universe and that predicted from fitting the Planck data, and appears to be unrelated to the tension between Planck and local estimates of the Hubble rate. In particular, combining DES, baryon acoustic oscillations, big bang nucleosynthesis, and supernovae measurements recover a Hubble constant and sound horizon consistent with Planck, and in tension with local distance-ladder measurements. If the tension between these various data sets persists, it is likely that reconciling all current data will require breaking the flat ΛCDM model in at least two different ways: one involving new physics in the early Universe, and one involving new late-time Universe physics. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
    ISSN
    0035-8711
    EISSN
    1365-2966
    DOI
    10.1093/mnras/staa2647
    Version
    Final published version
    Sponsors
    Ministry of Education, Culture, Sports, Science and Technology
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/staa2647
    Scopus Count
    Collections
    UA Faculty Publications

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