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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8675
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dc.contributor.authorKanodia, Brijesh-
dc.contributor.authorUpadhyay, Ujjwal-
dc.contributor.authorTiwari, Yashi-
dc.date.accessioned2026-02-27T11:14:45Z-
dc.date.available2026-02-27T11:14:45Z-
dc.date.issued2026-01-15-
dc.identifier.citationPhysical Review D, 2026, Vol. 113(2), AR No. 023505en_US
dc.identifier.issn2470-0029-
dc.identifier.urihttp://hdl.handle.net/2289/8675-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractThe cosmic distance duality relation (CDDR) connects the angular diameter distance (𝑑𝐴) and the luminosity distance (𝑑𝐿) at a given redshift. This fundamental relation holds in any metric theory of gravity, provided that photon number is conserved and light propagates along null geodesics. A deviation from this relation could indicate new physics beyond the standard cosmological model. In this work, we test the validity of the CDDR at very low redshifts (𝑧 <0.04) by combining 𝑑𝐴 from the Megamaser Cosmology Project with 𝑑𝐿 from the Pantheon + sample of type Ia supernovae (SNIa). We further incorporate high-redshift baryon acoustic oscillations- (BAO) based 𝑑𝐴 measurements from DESI DR2 in combination with SNIa data, highlighting the critical role of the 𝑟𝑑−𝑀𝑏 (early-late) calibration in testing the CDDR using these two probes. Assuming CDDR holds, we perform a Bayesian analysis to derive model-independent constraints on the calibration parameters. Using only BAO and SNIa data, we observe a strong degeneracy between 𝑟𝑑 and 𝑀𝑏. However, the inclusion of calibration-free megamaser measurements breaks this degeneracy, enabling independent constraints without relying on a specific cosmological model or distance-ladder techniques. Additionally, we present a forecast incorporating the expected precision from future megamaser and SNIa observations, demonstrating their potential to significantly tighten constraints on early-late calibration parameters, under the assumption of validity of CDDR.en_US
dc.language.isoenen_US
dc.publisherPhysical Review Den_US
dc.relation.urihttps://doi.org/10.48550/arXiv.2507.11518en_US
dc.relation.uriDOI: https://doi.org/10.1103/h3f5-7lcren_US
dc.rights© 2026 American Physical Societyen_US
dc.subjectCosmological parametersen_US
dc.titleRevisiting cosmic distance duality with megamasers and DESI DR2 observations: Model-independent constraints on early-late calibrationen_US
dc.typeArticleen_US
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