5 papers
GW231123 Mass Gap Event and the Primordial Black Hole Scenario
Chen Yuan, Zu-Cheng Chen, Lang Liu
We investigate the possibility that the recently reported GW231123 event, with component masses , and a local merger ra…
Polynomial Potential Inflation in the ACT Era: From CMB to Primordial Black Holes
Zhi-Zhang Peng, Zu-Cheng Chen, Lang Liu
The recent measurements from the Atacama Cosmology Telescope (ACT) favor a higher value of the scalar spectral index compared to the Planck data, challenging many well-establ…
On the Gauge Invariance of Secondary Gravitational Waves
Chen Yuan, Yizhou Lu, Zu-Cheng Chen +1
Second-order tensor perturbations induced by primordial fluctuations play a crucial role in probing small-scale physics, but gauge dependence of their energy density has remained a…
Gauge Dependence of Gravitational Waves Induced by Primordial Isocurvature Fluctuations
Chen Yuan, Zu-Cheng Chen, Lang Liu
Primordial isocurvature perturbations, which can arise from various sources in the early Universe, have the potential to leave observable imprints on the gravitational-wave backgro…
Search for a Gravitational-Wave Background from Sound Speed Resonance from Advanced LIGO and Advanced Virgo's First Three Observing Runs
You Wu, Zu-Cheng Chen, Lang Liu
We search for a stochastic gravitational-wave background (SGWB) originating from scalar-induced gravitational waves (SIGWs) with the sound speed resonance (SSR) effect using data f…