articlePhysical review. D/Physical review. D.Jan 15, 2026HYBRID OA

BAO miscalibration cannot rescue late-time solutions to the Hubble tension

DPDavide PedrottiLALuis A. EscamillaVMValerio MarraLPLeandros PerivolaropoulosSVSunny Vagnozzi

University of Trento · Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications · +6 more institutions

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Abstract

Baryon acoustic oscillation (BAO) measurements play a key role in ruling out postrecombination solutions to the Hubble tension. However, because the data compression leading to these measurements assumes a fiducial Λ CDM cosmology, their reliability in testing late-time modifications to Λ CDM has at times been called into question. We play devil’s advocate and posit that fiducial cosmology assumptions do indeed affect BAO measurements in such a way that low-redshift acoustic angular scales (proportional to the Hubble constant H 0 ) are biased low and test whether such a rescaling can rescue postrecombination solutions. The answer is no. First, strong constraints on the shape of the z ≲ 2 expansion…

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Topics
Keywords
  • Hubble's law
  • Cosmic microwave background
  • Dark energy
  • Baryon acoustic oscillations
  • Cosmology
  • Tension (geology)
  • Cosmological constant
  • COSMIC cancer database
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