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| Paper IPM / P / 17096 | ||||||||||||||||||||||||||||||
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Emerging high redshift cosmological probes, in particular quasars (QSOs), show a preference for larger matter densities, Ωm≈1, within the flat ΛCDM framework. Here, using the Risaliti-Lusso relation for standardizable QSOs, we demonstrate that the QSOs recover the \textit{same} Planck-ΛCDM Universe as Type Ia supernovae (SN), Ωm≈0.3 at lower redshifts 0<z≲, before transitioning to an Einstein-de Sitter Universe (\Omega_m =1) at higher redshifts z \gtrsim 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 \LambdaCDM Universe, whereby \Omega_m increases, H_0 decreases and S_8 increases with effective redshift, thus providing a new perspective on \LambdaCDM tensions; even in a Planck-\LambdaCDM Universe the current tensions may be expected.
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