2 papers
gr-qc2025
The transverse-traceless gauge and the gauge problem of second order gravitational waves
Yadong Xue, Zhoujian Cao
The gauge problem arises in the second order gravitational waves due to the mode mixing. Here, we introduce the transverse-traceless (TT) gauge to cosmological backgrounds, and fin…
gr-qc2024
On the transverse-traceless gauge condition when matters are presented
Yadong Xue, Xiaokai He, Zhoujian Cao
The transverse-traceless gauge condition is an important concept in the theory of gravitational wave. It is well known that vacuum is one of the key conditions to guarantee the exi…