论文标题
无偏见的宇宙学分析,类星体减轻$ H_0 $张力
A bias-free cosmological analysis with quasars alleviating $H_0$ tension
论文作者
论文摘要
由于标准宇宙学模型的理论和观察性不匹配,尤其是哈勃常数的当前差异,$ h_ {0} $,通过IA型ia supernovae(sne ia)和宇宙微波辐射(CMB)获得的$ H_ {0} $之间的当前差异,尤其是宇宙学模型及其参数。因此,考虑到具有中间红移(QSO)等高红移探针在SNE IA和CMB之间具有中间的红移,这是必要的步骤。在这项工作中,我们使用SNE IA和最新更新的QSO样本,达到最高$ z \ sim7.5 $的红移,并根据紫外线和X射线亮度之间的非线性关系应用Risaliti-lusso QSO关系。我们将这种关系以其原始形式考虑,并通过可靠的统计方法纠正了选择偏见和红移的演变,这也考虑了循环问题。我们还探讨了两种方法:在SNE IA上进行和不进行校准。然后,我们研究了扁平和非平板标准宇宙学模型和平坦的$ W $ CDM模型,并具有恒定的状态参数$ W $的暗能量方程。值得注意的是,当校正演变作为宇宙学的函数时,我们仅使用未校准的QSO就获得$ω_m$的封闭约束。我们发现,考虑非校准的QSO与SNE IA相结合并考虑相同的校正,我们的结果与$λ$ CDM型号兼容,$ω_m= 0.3 $和$ H_0 = 70 = 70 \,\ Mathrm {有趣的是,获得的$ H_0 $值位于SNE IA和CMB之间的中途位置,为新的见解铺平了$ H_0 $张力的道路。
Cosmological models and their parameters are widely debated because of theoretical and observational mismatches of the standard cosmological model, especially the current discrepancy between the value of the Hubble constant, $H_{0}$, obtained by Type Ia supernovae (SNe Ia), and the Cosmic Microwave Background Radiation (CMB). Thus, considering high-redshift probes like quasars (QSOs), having intermediate redshifts between SNe Ia and CMB, is a necessary step. In this work, we use SNe Ia and the most updated QSO sample, reaching redshifts up to $z\sim7.5$, applying the Risaliti-Lusso QSO relation based on a non-linear relation between ultraviolet and X-ray luminosities. We consider this relation both in its original form and corrected for selection biases and evolution in redshift through a reliable statistical method also accounting for the circularity problem. We also explore two approaches: with and without calibration on SNe Ia. We then investigate flat and non-flat standard cosmological models and a flat $w$CDM model, with a constant dark energy equation of state parameter $w$. Remarkably, when correcting for the evolution as a function of cosmology, we obtain closed constraints on $Ω_M$ using only non-calibrated QSOs. We find that considering non-calibrated QSOs combined with SNe Ia and accounting for the same correction, our results are compatible with a flat $Λ$CDM model with $Ω_M = 0.3$ and $H_0 = 70 \, \mathrm{km\,s^{-1}\,Mpc^{-1}}$. Intriguingly, the $H_0$ values obtained place halfway between the one from SNe Ia and CMB, paving the way for new insights into the $H_0$ tension.