Gravitational Waves by a Particle in Circular Orbits around a Schwarzschild black hole -5.5 Post-Newtonian Formula-

Details Gravitational Waves by a Particle in Circular Orbits around a Schwarzschild black hole -5.5 Post-Newtonian Formula- Gravitational Waves by a Particle in Circular Orbits around a Schwarzschild black hole -5.5 Post-Newtonian Formula-

1997-01-23

arxiv.org/abs/gr-qc/9701050v1

Prog.Theor.Phys.96:1087-1101,1996

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, ptptex, 2 figures

Scientific paper

10.1143/PTP.96.1087

Using the post-Newtonian (PN) expansion technique of the gravitational wave perturbation around a Schwarzschild black hole, we calculate analytically the energy flux of gravitational waves induced by a particle in circular orbits up to the 5.5PN order, i.e. $O(v^{11})$ beyond Newtonian. By comparing the formula with numerical data, we find that the error of the 5.5PN formula is about 4% when the particle is on the last stable circular orbit. We also estimate the error $\Delta N$ in the total cycle of gravitational waves from coalescing compact binaries in a laser interferometer's band produced by using the post-Newtonian approximations. We find that, as for the neutron star-black hole binaries, the 4.5PN approximation gives $\Delta N\alt1$ for a black hole of mass $M<40M_\odot$, while it gives $\Delta N\agt1$ for a black hole of mass $M>40M_{\odot}$.

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