Journal
PHYSICAL REVIEW D
Volume 103, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.103.L081301
Keywords
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Funding
- National Natural Science Foundation of China [12075041, 11605016, 11947406, 12047564]
- Fundamental Research Funds for the Central Universities [2020CDJQY-Z003]
- Chongqing Natural Science Foundation [cstc2020jcyj-msxmX0814]
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The NANOGrav Collaboration has provided strong evidence for a common-spectrum process in pulsar-timing data, suggesting it could be related to mergers of super massive black hole binaries or various stochastic gravitational-wave background sources in the early Universe. Bayesian analysis shows that the data favors cosmic strings as the gravitational-wave source over other possibilities.
The NANOGrav Collaboration recently reported a strong evidence for a stochastic common-spectrum process in the pulsar-timing data. We evaluate the evidence of interpreting this process as mergers of super massive black hole binaries and/or various stochastic gravitational-wave background sources in the early Universe, including first-order phase transitions, cosmic strings, domain walls, and large amplitude curvature perturbations. We discuss the implications of the constraints on these possible sources. It is found that the data shows a positive evidence in favor of the cosmic strings against other gravitational-wave sources based on the Bayes factor analysis.
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