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L. Liu, Z.-K. Guo and R.-G. Cai, Effects of the merger history on the merger rate density of primordial black hole binaries , Eur. Phys. J. C 79
Original
1901
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Y.-F. Cai, C. Chen, X. Tong, D.-G. Wang and S.-F. Yan, When Primordial Black Holes from Sound Speed Resonance Meet a Stochastic Background of Gravitational Waves , Phys. Rev. D 100
Original
1902
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Z.-C. Chen and Q.-G. Huang, Distinguishing Primordial Black Holes from Astrophysical Black Holes by Einstein Telescope and Cosmic Explorer , JCAP 08
Original
1904
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Original
1904
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C. Yuan, Z.-C. Chen and Q.-G. Huang, Probing primordial–black-hole dark matter with scalar induced gravitational waves , Phys. Rev. D 100
Original
1906
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Original
1907
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Y. Lu, Y. Gong, Z. Yi and F. Zhang, Constraints on primordial curvature perturbations from primordial black hole dark matter and secondary gravitational waves , JCAP 12
Original
1907
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C. Fu, P. Wu and H. Yu, Primordial Black Holes from Inflation with Nonminimal Derivative Coupling , Phys. Rev. D 100
Original
1907
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R.-G. Cai, S. Pi, S.-J. Wang and X.-Y. Yang, Pulsar Timing Array Constraints on the Induced Gravitational Waves , JCAP 10
Original
1907
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Original
1908
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C. Chen and Y.-F. Cai, Primordial black holes from sound speed resonance in the inflaton-curvaton mixed scenario , JCAP 10
Original
1908
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Original
1910
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Z.-C. Chen, C. Yuan and Q.-G. Huang, Pulsar Timing Array Constraints on Primordial Black Holes with NANOGrav 11-Year Dataset , Phys. Rev. Lett. 124
Original
1910
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Original
1912
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Original
1912
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Original
2001
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Original
2001
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Similar

I.M. Romero-Shaw et al., Bayesian inference for compact binary coalescences with bilby: validation and application to the first LIGO–Virgo gravitational-wave transient catalogue , Mon. Not. Roy. Astron. Soc. 499
Original
2006
Cited alongside, same era.
K.N. Ananda, C. Clarkson and D. Wands, The Cosmological gravitational wave background from primordial density perturbations , Phys. Rev. D 75
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Original
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Cited alongside, same era.
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Then

J.R. Espinosa, D. Racco and A. Riotto, A Cosmological Signature of the SM Higgs Instability: Gravitational Waves , JCAP 09
Original
2018
Later among the works it cites.
M. Sasaki, T. Suyama, T. Tanaka and S. Yokoyama, Primordial black holes—perspectives in gravitational wave astronomy , Class. Quant. Grav. 35
Original
2018
Later among the works it cites.
R.-g. Cai, S. Pi and M. Sasaki, Gravitational Waves Induced by non-Gaussian Scalar Perturbations , Phys. Rev. Lett. 122
Original
2019
Later among the works it cites.
Z.-C. Chen, F. Huang and Q.-G. Huang, Stochastic Gravitational-wave Background from Binary Black Holes and Binary Neutron Stars and Implications for LISA , Astrophys. J. 871
Original
2019
Later among the works it cites.
L. Liu, Z.-K. Guo and R.-G. Cai, Effects of the surrounding primordial black holes on the merger rate of primordial black hole binaries , Phys. Rev. D 99

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2023

Confronting sound speed resonance with pulsar timing arrays

Jin, Jia-Heng, Chen, Zu-Cheng, Yi, Zhu et al.

Understand

The stochastic signal detected by pulsar timing arrays (PTAs) has raised great interest in understanding its physical origin.

Assuming the signal is a cosmological gravitational-wave background produced by overly large primordial curvature perturbations, we investigate the sound speed resonance effect with an oscillatory behavior using the combined PTA data from NANOGrav 15-yr data set, PPTA DR3, and EPTA DR2.
We find that the stochastic signal can be explained by the induced gravitational waves sourced by the sound speed resonance mechanism, with the oscillation frequency $f_* \in [1.51, 4.90] \times 10^{-7}$Hz and the start time of oscillation $|\tau_0| \in [2.05, 106] \times 10^7$s