81 citations · 1.4k across the 54 of their papers we have counts for
4 papers · 1 filter
On the Gauge Invariance of Scalar Induced Gravitational Waves: Gauge Fixings Considered
Zhe Chang, Sai Wang, Qing-Hua Zhu
The energy density spectrum is an observable of gravitational waves. Divergence has appeared in the energy density spectra of the scalar induced gravitational waves for different g…
Gauge Invariant Second Order Gravitational Waves
Zhe Chang, Sai Wang, Qing-Hua Zhu
We investigate the gauge invariance of the second order gravitational waves induced by the first order scalar perturbations by following the Lie derivative method. It is shown expl…
Note on gauge invariance of second order cosmological perturbations
Zhe Chang, Sai Wang, Qing-Hua Zhu
We study the gauge invariant cosmological perturbations up to second order. We show that there are infinite families of gauge invariant variables at both of the first and second or…
Tests of CPT invariance in gravitational waves with LIGO-Virgo catalog GWTC-1
Sai Wang, Zhi-Chao Zhao
A discovery of gravitational waves from binary black holes raises a possibility that measurements of them can provide strict tests of CPT invariance in gravitational waves. When CP…