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, Rh = ct and ΛCDM 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 ΛCDM over Rh=ct with a relative probability of 86.30% versus 13.70%.
@article{arxiv.2306.16828,
title = {A comparison of cosmological models with high-redshift quasars},
author = {Liuyuan Fan and Guanwen Fang and Jian Hu},
journal= {arXiv preprint arXiv:2306.16828},
year = {2023}
}
Comments
10 pages, 5 figures, Accepted for publication in APSS