46 citations · 127 across the 13 of their papers we have counts for
7 papers · 1 filter
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…
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…
Constraining the nonstandard propagating gravitational waves in the cosmological background with GWTC-3
Zu-Cheng Chen, Lang Liu
The detection of gravitational waves (GWs) has opened a new window to test the fundamental nature of gravity. We present constraints on the nonstandard propagation of GWs using the…
Can we distinguish the adiabatic fluctuations and isocurvature fluctuations with pulsar timing arrays?
Zu-Cheng Chen, Lang Liu
Understanding the nature of primordial fluctuations is pivotal to unraveling the Universe's early evolution. While these fluctuations are observed to be nearly scale-invariant, qua…
Simultaneously probing the sound speed and equation of state of the early Universe with pulsar timing arrays
Lang Liu, You Wu, Zu-Cheng Chen
Recently, several major pulsar timing array (PTA) collaborations have assembled strong evidence for the existence of a gravitational-wave background at frequencies around the nanoh…