Domain wall network:A dual solution for gravitational waves and Hubble tension?  

作　　者：Ligong Bian Shuailiang Ge Changhong Li Jing Shu Junchao Zong 

机构地区：[1]Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 401331,China [2]Center for High Energy Physics,Peking University,Beijing 100871,China [3]School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China [4]Department of Astronomy,Key Laboratory of Astroparticle Physics of Yunnan Province,School of Physics and Astronomy,Yunnan University,Kunming 650091,China [5]Beijing Laser Acceleration Innovation Center,Beijing 101400,China [6]Department of Physics,Nanjing University,Nanjing 210093,China [7]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第11期39-46,共8页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant Nos.2020YFC2201501,and 2021YFC2203004);supported by the National Natural Science Foundation of China (Grant Nos.12075041 and 12147102);supported by the National Natural Science Foundation of China (Grant No.12247147);the International Postdoctoral Exchange Fellowship Program;the Boya Postdoctoral Fellowship of Peking University;supported by the National Natural Science Foundation of China (Grant Nos.11963005,and 11603018);Yunnan Provincial Foundation (Grant Nos.2016FD006,and 2019FY003005);Reserved Talents for Young and Middle-aged Academic and Technical Leaders in Yunnan Province Program;Yunnan Provincial High level Talent Training Support Plan Youth Top Program;the National Natural Science Foundation of China (Grant No.11847301);the Fundamental Research Funds for the Central Universities (Grant No.2019CDJDWL0005);supported by Peking Uniersity (Grant No.7101302974);the National Natural Science Foundation of China (Grant Nos.12025507,and 12150015);the Key Research Program of Frontier Science of the Chinese Academy of Sciences (CAS) (Grant No.ZDBS-LY-7003)。

摘　　要：We explore the possibility that domain wall networks generate the stochastic gravitational wave background(SGWB) observed as a strong common power-law process in the Data Release-2 of Parkes Pulsar Timing Array. We find that a broad range of parameters, specifically wall tension around σ_(DW)^(29-414 TeV)^(3) and wall-decay temperature within T_(d) ~ 20-257 MeV, can explain this phenomenon at a 68% credible level. Meanwhile, the same parameters could ease the Hubble tension if particles from these domain wall networks decay into dark radiation. We establish a direct analytical relationship, ΩGW(f_(p), T_(0))h^(2)~ Ω_(rad)h^(2)(Ω_νΩN_(eff))^(2),to illustrate this coincidence, underlining its importance in the underlying physics and potential applicability to a wider range of models and data. Conversely, if the common power-law process is not attributed to domain wall networks, our findings impose tight limits on the wall tension and decay temperature.

关 键 词：domain wall gravitational waves Hubble tension 

分 类 号：P142.84[天文地球—天体物理]