Restoring cosmological concordance with axion-like early dark energy and dark matter characterized by a constant equation of state?  

作　　者：Yan-Hong Yao Xin-He Meng 

机构地区：[1]School of Physics and Astronomy,Sun Yatsen University 2 Daxue Road,Tangjia,Zhuhai,China [2]School of Physics,Nankai University 94 Weijin Road,Nankai,Tianjin,China

出　　处：《Communications in Theoretical Physics》2024年第7期74-82,共9页理论物理通讯（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2020YFC2201600);the National Natural Science Foundation of China(NSFC)under Grant No.12073088;the National SKA Program of China No.2020SKA0110402.

摘　　要：The Hubble tension persists as a challenge in cosmology.Even early dark energy(EDE)models,initially considered the most promising for alleviating the Hubble tension,fall short of addressing the issue without exacerbating other tensions,such as the S_(8)tension.Considering that a negative dark matter(DM)equation of state(EoS)parameter is conducive to reduce the value of the σ_(8)parameter,we extend the axion-like EDE model in this paper by replacing the cold dark matter(CDM)with DM characterized by a constant EoS w_(dm)(referred to as WDM hereafter).We then impose constraints on this axion-like EDE extension model,along with three other models:the axion-like EDE model,ΛWDM,and ΛCDM.These constraints are derived from a comprehensive analysis incorporating data from the Planck 2018 cosmic microwave background,baryon acoustic oscillations,and the Pantheon compilation,as well as a prior on H_(0)(i.e.H_(0)=73.04±1.04,based on the latest local measurement by Riess et al)and a Gaussianized prior on S_(8)(i.e.S_(8)=0.766±0.017,determined through the joint analysis of KID1000+BOSS+2dLenS).We find that although the new model maintains the ability to alleviate the Hubble tension to~1.4σ,it still exacerbates the S_(8)tension to a level similar to that of the axion-like EDE model.

关 键 词：Hubble tension early dark energy noncold dark matter S8 tension 

分 类 号：P145.9[天文地球—天体物理]