A comparison of cosmological models with high-redshift quasars

TL;DR

This study uses high-redshift quasars to compare cosmological models, finding that the standard $\\Lambda$CDM model is statistically favored over the $R_h=ct$ model based on quasar luminosity data.

Contribution

It provides a comparative analysis of cosmological models using a large quasar dataset, highlighting the preference for $\\Lambda$CDM.

Findings

Akaike Information Criterion favors $\\Lambda$CDM with 86.3% probability.

High-redshift quasars can effectively distinguish between cosmological models.

The dataset extends to redshift 6, providing strong constraints on models.

Abstract

The non-linear relationship between the monochromatic X-ray and UV luminosities in quasars offers the possibility of using high-z quasars as standard candles for cosmological testing. In this paper, we use a high-quality catalog of 1598 quasars extending to redshift 6, to compare the flat and uniformly expanding cosmological model, $R_h$ = ct and $\Lambda$CDM cosmological models which are the most debated. The quasar samples are mainly from the XMM-Newton and the Sloan Digital Sky Survey (SDSS). The final result is that the Akaike Information Criterion favors $\Lambda$CDM over $R_h$=ct with a relative probability of 86.30% versus 13.70%.