Preliminary cosmological results using extreme accretors Quasar formalism

Rodrigo Sandoval-Orozco; Castalia Alenka Negrete; Paola Marziani; Jackson Levi Said

doi:10.1016/j.dark.2026.102331

paper

Preliminary cosmological results using extreme accretors Quasar formalism

arXiv:2605.24884 · doi:10.1016/j.dark.2026.102331

Abstract

We revisited the xA Quasar formalism from the cosmological point of view, where a completely cleaned and standardized sample is compiled from different literature references. This allowed us to test three different cosmological models including $w$ CDM and $w_{0} w_{a}$ CDM and $Λ$ CDM resulting in a Hubble constant estimation of $H_{0} = 69.8 \pm 2.2$ ~ $km s^{- 1} Mp c^{- 1}$ for the compiled sample alone and $H_{0} = 69.0 \pm 0.9$ ~ $km s^{- 1} Mp c^{- 1}$ when combined with Type I Supernovae (SNIa), Cosmic Chronometers and the Cosmic Microwave Background (CMB) distance priors. Using both the $w$ CDM and $w_{0} w_{a}$ CDM a weak Bayesian preference for the dynamical dark energy models over the $Λ$ CDM model was found. A comparative analysis was performed with other AGN based methods in cosmology like the Reverberation Mapping, the X-Ray and UV non-linear relation and the Angular distance measurements. We conclude that the significant intrinsic dispersion is a key issue present in all samples. Overcoming this dispersion is key to establish xA and other AGN samples as robust and precise cosmological probes.

Accepted for Publication on Physics of the Dark Universe to appear on June 2026

Preliminary cosmological results using extreme accretors Quasar formalism

Abstract

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