首页|Cosmological interpretation for the stochastic signal in pulsar timing arrays

Cosmological interpretation for the stochastic signal in pulsar timing arrays

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The pulsar timing array(PTA)collaborations have recently reported compelling evidence for a stochastic signal consistent with a gravitational-wave background.In this paper,we combine the latest data sets from NANOGrav,PPTA,and EPTA to explore cosmological interpretations for the PTA signal from first-order phase transitions,domain walls,and cosmic strings,respectively.We find that the domain wall model is strongly disfavored with the Bayes factors compared with the first-order phase transitions and cosmic strings being 1/90 and 1/189,respectively,breaking the degeneracy among these models in individual data set.We also find that:(1)a strong phase transition at temperatures below the electroweak scale is favored,and the bubble collisions make the dominant contribution to the energy density spectrum;(2)a small reconnection probability p＜1.55 × 10-1 allowed by strings in(super)string theory is favored at the 95％confidence level,and ground-based detectors can further constrain the parameter space.

puslar timing arraysgravitational-wave backgroundfirst-order phase transitionsdomain wallscosmic strings

Yu-Mei Wu、Zu-Cheng Chen、Qing-Guo Huang

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School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China

School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Department of Astronomy,Beijing Normal University,Beijing 100875,China

Advanced Institute of Natural Sciences,Beijing Normal University,Zhuhai 519087,China

Department of Physics and Synergistic Innovation Center for Quantum Effects and Applications,Hunan Normal University,Changsha 410081,China

CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China

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国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金中国科学院前沿科学重点研究计划CAS Project for Young Scientists in Basic Research中国科学院重点研究项目国家自然科学基金国家自然科学基金China Postdoctoral Science Foundation Fellowship

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2024

10.1007/s11433-023-2298-7

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(4)
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