The S_(8)tension in light of updated redshift-space distortion data and PAge approximation

作     者：Lu Huang Zhiqi Huang Huan Zhou Zhuoyang Li Lu Huang;Zhiqi Huang;Huan Zhou;Zhuoyang Li

作者机构：School of Physics and AstronomySun Yat-sen UniversityZhuhai 519082China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2022年第65卷第3期

页      面：114-121页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：supported by the National SKA Program of China(Grant No.2020SKA0110402) the National Natural Science Foundation of China(Grant No.12073088) the National Key Research and Development Program of China(Grant No.2020YFC2201600) the Science Research grants from the China Manned Space Project(Grant No.CMS-CSST-2021-B01) the Fundamental Research Funds for the Central Universities(Sun Yat-sen University,Grant No.2021qntd28) the Guangdong Major Project of Basic and Applied Basic Research(Grant No.2019B030302001)。 

主　　题：observational cosmology large-scale structure of the Universe dark matter 

摘      要：One of the most prominent challenges to the standard Lambda cold dark matter(ΛCDM) cosmology is the tension between the structure growth parameter S;constrained by the cosmic microwave background(CMB) data and the smaller one suggested by the cosmic shear data. Recent studies show that, for ΛCDM cosmology, redshift-space distortion(RSD) data also prefers a smaller S;that is ~ 2-3σ lower than the CMB value, but the result is sensitive to the cosmological model. In the present work we update the RSD constraint on S;with the most up-to-date RSD data set where the correlation between data points is properly taken into account. To reduce the model dependence, we add in our Monte Carlo Markov Chain calculation the most up-to-date data sets of Type Ia supernovae(SN) and baryon acoustic oscillations(BAO), whose correlation with RSD is also taken into account, to constrain the background geometry. For ΛCDM cosmology we find S_(8)= 0.812 ± 0.026, which is ~ 2σ larger than previous studies, and hence is consistent with the CMB constraint. By replacing ΛCDM with the parameterization based on cosmic Age(PAge), an almost model-independent description of the late universe, we find that the RSD + SN + BAO constraint on S;is insensitive to the cosmological model.