The quadrupole moment of compact binaries to the fourth post-Newtonian order. I: Non-locality in time and infra-red divergencies. (English) Zbl 1498.83012
Summary: With the aim of providing high accuracy post-Newtonian (PN) templates for the analysis of gravitational waves generated by compact binary systems, we complete the analytical derivation of the source type mass quadrupole moment of compact binaries (without spins) at the fourth PN order of general relativity. Similarly to the case of the conservative 4PN equations of motion, we show that the quadrupole moment at that order contains a non-local (in time) contribution, arising from the tail-transported interaction entering the conservative part of the dynamics. Furthermore, we investigate the infra-red (IR) divergences of the quadrupole moment. In a previous work, this moment has been computed using a Hadamard partie finie procedure for the IR divergences, but the knowledge of the conservative equations of motion indicates that those divergences have to be dealt with by means of dimensional regularization. This work thus derives the difference between the two regularization schemes, which has to be added on top of the previous result. We show that unphysical IR poles start to appear at the 3PN order, and we determine all of these up to the 4PN order. In particular, the non-local tail term comes in along with a specific pole at the 4PN order. It will be proven in a companion paper that the poles in the source-type quadrupole are cancelled in the physical radiative type quadrupole moment measured at future null infinity.
For Part II, see [the authors, ibid. 39, No. 11, Article ID 115008, 25 p. (2022; Zbl 1498.83011)].
For Part II, see [the authors, ibid. 39, No. 11, Article ID 115008, 25 p. (2022; Zbl 1498.83011)].
MSC:
| 83C35 | Gravitational waves |
| 83C57 | Black holes |
| 70F05 | Two-body problems |
| 81V35 | Nuclear physics |
| 81V60 | Mono-, di- and multipole moments (EM and other), gyromagnetic relations |
Citations:
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