A comparison of cosmological models with high-redshift quasars

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 similar to 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 similar to 86.30% versus similar to 13.70%.