A comparison of the R_h=ct and LCDM cosmologies using the Cosmic Distance Duality Relation
AffiliationUniv Arizona, Dept Phys, Program Appl Math
Univ Arizona, Dept Astron
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PublisherOXFORD UNIV PRESS
CitationFulvio Melia; A comparison of the Rh = ct and ΛCDM cosmologies using the cosmic distance duality relation, Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 4, 21 December 2018, Pages 4855–4862, https://doi.org/10.1093/mnras/sty2596
Rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractThe cosmic distance duality (CDD) relation (based on the Etherington reciprocity theorem) plays a crucial role in a wide assortment of cosmological measurements. Attempts at confirming it observationally have met with mixed results, though the general consensus appears to be that the data do support its existence in nature. A common limitation with past approaches has been their reliance on a specific cosmological model, or on measurements of the luminosity distance to Type Ia SNe, which introduces a dependence on the presumed cosmology in spite of beliefs to the contrary. Confirming that the CDD is actually realized in nature is crucial because its violation would require exotic new physics. In this paper, we study the CDD using the observed angular size of compact quasar cores and a Gaussian Process reconstruction of the H II galaxy Hubble diagram – without pre-assuming any particular background cosmology. In so doing, we confirm at a very high level of confidence that the angular-diameter and luminosity distances do indeed satisfy the CDD. We then demonstrate the potential power of this result by utilizing it in a comparative test of two competing cosmological models – the Rh = ct universe and ΛCDM – and show that Rh = ct is favoured by the CDD data with a likelihood ∼82.3 per cent compared with ∼17.7 per cent for the standard model.
VersionFinal accepted manuscript