On the gravitational wave sources from the NANOGrav 12.5-yr data

Abstract

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 cosmic string is the most favored source against other gravitational wave sources based on the Bayes factor analysis.

arXiv comment10 pages, 13 figures, 1 table

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• Searching For Gravitational Waves From Cosmological Phase Transitions With The NANOGrav 12.5-year dataset
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• NANOGrav signal and LIGO-Virgo Primordial Black Holes from the Higgs field
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• Gravitational waves from a dark $U(1{)}_D$ phase transition in the light of NANOGrav 12.5 yr data
• Pulsar Timing Residual induced by Wideband Ultralight Dark Matter with Spin 0, 1, 2
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• Cosmological scaling of precursor domain walls
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