11 papers
Alternative LISA-TAIJI networks: polarization separation of the stochastic gravitational wave background
Gang Wang, Lang Liu
Stochastic gravitational-wave backgrounds (SGWBs) provide a unique opportunity to probe both unresolved astrophysical populations and fundamental physics in the early Universe. Fut…
Scalar-induced gravitational waves from a box-shaped curvature power spectrum
Zu-Cheng Chen, Lang Liu
We compute the stochastic background of gravitational waves (GWs) produced at second order in cosmological perturbation theory by a primordial curvature power spectrum that is flat…
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…
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…
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…
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…