Quasars calibrated with cosmic chronometers produce cosmological constraints inconsistent with standard probes, and the paper concludes they are not yet reliable distance indicators, though key error sources are not propagated.
E., Shafieloo A., Zheng X., Cao S., Biesiada M., Zhu Z.-H., 2021, @doi [Monthly Notices of the Royal Astronomical Society] 10.1093/mnras/stab2154 , 507, 919
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On the Reliability of Quasars as Cosmological Distance Indicators
Quasars calibrated with cosmic chronometers produce cosmological constraints inconsistent with standard probes, and the paper concludes they are not yet reliable distance indicators, though key error sources are not propagated.