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    Cosmological tests with the joint lightcurve analysis

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    Author
    Melia, F.
    Wei, J.-J.
    Maier, R.S.
    Wu, X.-F.
    Affiliation
    Univ Arizona, Dept Phys, Appl Math Program
    Univ Arizona, Dept Astron
    Univ Arizona, Dept Phys
    Univ Arizona, Dept Math
    Univ Arizona, Statistics Program
    Issue Date
    2018-10-05
    
    Metadata
    Show full item record
    Publisher
    EPL ASSOCIATION
    Citation
    Melia, F., Wei, J. J., Maier, R. S., & Wu, X. F. (2018). Cosmological tests with the joint lightcurve analysis. EPL (Europhysics Letters), 123(5), 59002.
    Journal
    EPL (Europhysics Letters)
    Rights
    Copyright © EPLA, 2018.
    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 examine whether a comparison between wCDM and $R_{\textrm{h}}=ct$ using merged Type-Ia SN catalogs produces results consistent with those based on a single homogeneous sample. Using the Betoule et al. (Astron. Astrophys., 568 (2014) 22). Joint Lightcurve Analysis (JLA) of a combined sample of 613 events from SNLS and SDSS-II, we estimate the parameters of the two models and compare them. We find that the improved statistics can alter the model selection in some cases, but not others. In addition, based on the model fits, we find that there appears to be a lingering systematic offset of ~0.04–0.08 mag between the SNLS and SDSS-II sources, in spite of the cross-calibration in the JLA. Treating wCDM, ΛCDM and $R_{\textrm{h}}=ct$ as separate models, we find in an unbiased pairwise statistical comparison that the Bayes Information Criterion (BIC) favors the $R_{\textrm{h}}=ct$ Universe with a likelihood of $82.8\%$ vs. $17.2\%$ for wCDM, but the ratio of likelihoods is reversed ($16.2\%$ vs. $83.8\%$ ) when $w_{\textrm{de}}=-1$ (i.e., ΛCDM) and strongly reversed ($1.0\%$ vs. $99.0\%$ ) if in addition k = 0 (i.e., flat ΛCDM). We point out, however, that the value of k is a measure of the net energy (kinetic plus gravitational) in the Universe and is not constrained theoretically, though some models of inflation would drive $k\rightarrow 0$ due to an expansion-enforced dilution. Since we here consider only the basic ΛCDM model, the value of k needs to be measured and, therefore, the pre-assumption of flatness introduces a significant bias into the BIC.
    Note
    12 month embargo; published 5 October 2018
    ISSN
    1286-4854
    DOI
    10.1209/0295-5075/123/59002
    Version
    Final accepted manuscript
    Additional Links
    http://iopscience.iop.org/article/10.1209/0295-5075/123/59002
    ae974a485f413a2113503eed53cd6c53
    10.1209/0295-5075/123/59002
    Scopus Count
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    UA Faculty Publications

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