The nanohertz stochastic gravitational wave background from cosmic string loops and the abundant high redshift massive galaxies  

作　　者：Ziwei Wang Lei Lei Hao Jiao Lei Feng Yi-Zhong Fan 

机构地区：[1]Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210023,China [2]School of Astronomy and Space Science,University of Science and Technology of China,Hefei 230026,China [3]Department of Physics,McGill University,Montreal H3A 2T8,Canada

出　　处：《Science China(Physics,Mechanics & Astronomy)》2023年第12期11-19,共9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 No.2022YFF0503304);the National Natural Science Foundation of China(Grant No.11921003);the New Cornerstone Science Foundation through the XPLORER PRIZE;the Chinese Academy of Sciences;the Entrepreneurship and Innovation Program of Jiangsu Province。

摘　　要：Recently,pulsar timing array(PTA)experiments have provided compelling evidence for the existence of the nanohertz stochastic gravitational wave background(SGWB).In this work,we demonstrated that cosmic string loops generated from cosmic global strings offer a viable explanation for the observed nanohertz SGWB data,requiring a cosmic string tension parameter of log(Gμ)~-12 and a loop number density of log N~4.Additionally,we revisited the impact of cosmic string loops on the abundance of massive galaxies at high redshifts.However,our analysis revealed challenges in identifying a consistent parameter space that can concurrently explain both the SGWB data and observations from the James Webb Space Telescope.This indicates the necessity for either extending the existing model employed in this research or acknowledging distinct physical origins for these two phenomena.

关 键 词：nanohertz stochastic gravitational-wave background cosmic string loop JamesWebb Space Telescope galaxy formation 

分 类 号：P15[天文地球—天文学]