Cluster gas fractions and Pantheon+ supernovae support constant speed of light under CLASH and CCCP mass calibrations but indicate 2σ tension under Planck calibration.
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Revisiting the Constancy of the Speed of Light: Galaxy Cluster Mass Bias Implications
Cluster gas fractions and Pantheon+ supernovae support constant speed of light under CLASH and CCCP mass calibrations but indicate 2σ tension under Planck calibration.