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arXiv · 2309.05991

Gravitational Radiation from Eccentric Binary Black Hole System in Dynamical Chern-Simons Gravity

Zhao Li·Jin Qiao·Tan Liu·Rui Niu·Shaoqi Hou·Tao Zhu·Wen Zhao
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Abstract

Dynamical Chern-Simons (DCS) gravity, a typical parity-violating gravitational theory, modifies both the generation and propagation of gravitational waves from general relativity (GR). In this work, we derive the gravitational waveform radiated from a binary black hole system with eccentric orbits under the spin-aligned assumption in the DCS theory. Compared with GR, DCS modification enters the second-order post-Newtonian (2PN) approximation, affecting the spin-spin coupling and monopole-quadrupole coupling of binary motion. This modification produces an extra precession rate of periastron. This effect modulates the scalar and gravitational waveform through a quite low frequency. Additionally, the dissipation of conserved quantities results in the secular evolution of the semimajor axis and the eccentricity of binary orbits. Finally, the frequency-domain waveform is given in the post-circular scheme, requiring the initial eccentricity to be $\lesssim0.3$. This ready-to-use template will benefit the signal searches and improve the future constraint on DCS theory.

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Zhao Li, Jin Qiao, Tan Liu, Rui Niu, Shaoqi Hou, Tao Zhu, Wen Zhao. 2023-09-12. Gravitational Radiation from Eccentric Binary Black Hole System in Dynamical Chern-Simons Gravity. https://doi.org/10.1088/1475-7516%2F2024%2F05%2F073

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