首页|Mirror QCD phase transition as the origin of the nanohertz Stochastic Gravitational-Wave Background

Mirror QCD phase transition as the origin of the nanohertz Stochastic Gravitational-Wave Background

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Several Pulsar Timing Array(PTA)Collaborations have recently provided strong evidence for a nHz Stochastic Gravitational-Wave Background(SGWB).Here we investigate the implications of a first-order phase transition occurring within the early Universe's dark quantum chromodynamics epoch,specifically within the framework of the mirror twin Higgs dark sector model.Our analysis indicates a distinguishable SGWB signal originating from this phase transition,which can explain the measurements obtained by PTAs.Remarkably,a significant portion of the parameter space for the SGWB signal also effectively resolves the existing tensions in both the H0 and S8 measurements in Cosmology.This intrigu-ing correlation suggests a possible common origin of these three phenomena for 0.2＜ΔNeff＜0.5,where the mirror dark matter component constitutes less than 30％of the total dark matter abundance.Next-generation CMB experiments such as CMB-S4 can test this parameter region.

Mirror twin HiggsDark matterPhase transitionGravitational wavePulsar timing array

Lei Zu、Chi Zhang、Yao-Yu Li、Yuchao Gu、Yue-Lin Sming Tsai、Yi-Zhong Fan

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Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China

School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China

国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金New Cornerstone Science Foundation through the XPLORER PRIZE中国科学院项目Entrepreneurship and Innovation Program of Jiangsu Province

2022YFF05033042022YFF05033011192100312003069

2024

10.1016/j.scib.2024.01.037

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(6)
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