首页|Restoring cosmological concordance with axion-like early dark energy and dark matter characterized by a constant equation of state?
Restoring cosmological concordance with axion-like early dark energy and dark matter characterized by a constant equation of state?
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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 S8 tension.Considering that a negative dark matter(DM)equation of state(EoS)parameter is conducive to reduce the value of the σ8 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 wdm(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,AWDM,and ACDM.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 H0(i.e.H0=73.04±1.04,based on the latest local measurement by Riess et al)and a Gaussianized prior on S8(i.e.S8=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 S8 tension to a level similar to that of the axion-like EDE model.
Hubble tensionearly dark energynoncold dark matterS8 tension
Yan-Hong Yao、Xin-He Meng
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School of Physics and Astronomy,Sun Yat-sen University 2 Daxue Road,Tangjia,Zhuhai,China
School of Physics,Nankai University 94 Weijin Road,Nankai,Tianjin,China
National Key R&D Program of ChinaNational Natural Science Foundation of China(NSFC)National SKA Program of China
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