Revealing intrinsic flat ΛCDM biases with standardizable candles

Emerging high-redshift cosmological probes, in particular quasars (QSOs), show a preference for larger matter densities, Omega(m) approximate to 1, within the flat Lambda CDM framework. Here, using the Risaliti-Lusso relation for standardizable QSOs, we demonstrate that the QSOs recover the same Planck-Lambda CDM universe as type Ia supernovae (SN), Omega(m) approximate to 0.3 at lower redshifts 0 < z less than or similar to 0.7, before transitioning to an Einstein-de Sitter universe (Omega(m) = 1) at higher redshifts z greater than or similar to 1. We illustrate the same trend, namely increasing Omega(m) and decreasing H-0 with redshift, in SN but poor statistics prevent a definitive statement. We explain physically why the trend may be expected and show the intrinsic bias through non-Gaussian tails with mock SN data. Our results highlight an intrinsic bias in the flat Lambda CDM universe, whereby Omega(m) increases, H-0 decreases and S-8 increases with effective redshift, thus providing a new perspective on Lambda CDM tensions; even in a Planck-Lambda CDM universe the current tensions may be expected.

Automated summary

Emerging high-redshift cosmological probes, particularly quasars, show a preference for larger matter densities. The study also found that at lower redshifts, the universe has a lower matter density, and as the redshift increases, the matter density increases. This finding provides a new perspective on our understanding of the universe.