5 papers
Effective metric for bound state in an effective-one-body theory based on the third-post-Minkowskian approximation
Hanjun Zou, Sheng Long, Xiaokai He +1
The effective-one-body (EOB) framework, originally formulated within the post-Newtonian (PN) expansion, is central to modeling and interpreting gravitational-wave signals. Recent d…
Scale dependence of the effective gravitational constant from functional renormalization group
Ruiqi Liang, Zhoujian Cao, Bing Sun
The general relativity may not be the final theory of gravity. One possible way to look for the gravity theory beyond general relativity is considering variable gravitational const…
Constructing the canonical harmonic coordinates of Kerr metric to the fourth post-Minkowskian order
Zizheng Xing, Xiaokai He, Zhoujian Cao
In this paper we construct the canonical harmonic coordinates of the Kerr metric within the multipolar post-Minkowskian (MPM) formalism to the fourth post-Minkowskian (4PM) order.…
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…
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…