A Distance-deviation Consistency and Model-independent Method to Test the Cosmic Distance–Duality Relation

Abstract A distance-deviation consistency and model-independent method to test the cosmic distance–duality relation (CDDR) is provided. This method is worthy of attention for two reasons. First, a distance-deviation consistency method is used to pair subsamples: instead of pairing subsamples with re...

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Bibliographic Details
Published inThe Astrophysical journal Vol. 909; no. 2; p. 118
Main Authors Zhou, Chichun, Hu, Jian, Li, Maocai, Yin, Xunchang, Fang, Guanwen
Format Journal Article
LanguageEnglish
Published Philadelphia IOP Publishing 01.03.2021
Subjects
Astrophysics
Confidence intervals
Consistency
Deviation
Gravitational lenses
Light curve
Luminosity
Red shift
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Summary:Abstract A distance-deviation consistency and model-independent method to test the cosmic distance–duality relation (CDDR) is provided. This method is worthy of attention for two reasons. First, a distance-deviation consistency method is used to pair subsamples: instead of pairing subsamples with redshift deviations smaller than a value of, say, . The redshift deviation between subsamples decreases with the redshift to ensure the distance deviation stays the same. The method selects more subsamples at high redshift, up to z = 2.16, and provides 120 subsample pairs. Second, the model-independent method involves the latest data set of 1048 SNe Ia and 205 strong gravitational lensing systems (SGLS), which are used to obtain the luminosity distances D L and the ratio of angular diameter distance D A , respectively. With the model-independent method, parameters of the CDDR, the SNe Ia light curve, and the SGLS are fitted simultaneously. The result shows that and CDDR is validated at the 1 σ confidence level in the form of .
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/abc9bf