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Bayesian Implications for the Primordial Black Holes from NANOGrav's Pulsar-Timing Data Using the Scalar-Induced Gravitational Waves
Zhi-Chao Zhao, Sai Wang
Assuming that the common-spectrum process in the NANOGrav 12.5-year dataset has an origin of scalar-induced gravitational waves, we study the enhancement of primordial curvature pe…
Multi-TeV photons from GRB 221009A: uncertainty of optical depth considered
Zhi-Chao Zhao, Yong Zhou, Sai Wang
It is reported that the Large High Altitude Air Shower Observatory (LHAASO) observed thousands of very-high-energy photons up to 18 TeV from GRB 221009A. We study the surviva…
Cosmological 21cm line observations to test scenarios of super-Eddington accretion on to black holes being seeds of high-redshifted supermassive black holes
Kazunori Kohri, Toyokazu Sekiguchi, Sai Wang
In this paper, we study scenarios of the super-Eddington accretion onto black holes at high redshifts , which are expected to be seeds to evolve to supermassive black holes…
Search for the birefringence of gravitational waves with the third observing run of Advanced LIGO-Virgo
Zhi-Chao Zhao, Zhoujian Cao, Sai Wang
Gravitational waves would attain birefringence during their propagation from distant sources to the Earth, when the CPT symmetry is broken. If it was sizeable enough, such birefrin…