Calculation of radiation reaction effect on orbital parameters in Kerr spacetime

Abstract

We calculate the secular changes of the orbital parameters of a point particle orbiting a Kerr black hole, due to the gravitational radiation reaction. For this purpose, we use the post-Newtonian (PN) approximation in the first order black hole perturbation theory, with the expansion with respect to the orbital eccentricity. In this work, the calculation is done up to the fourth post-Newtonian (4PN) order and to the sixth order of the eccentricity, including the effect of the absorption of gravitational waves by the black hole. We confirm that, in the Kerr case, the effect of the absorption appears at the 2.5PN order beyond the leading order in the secular change of the particle's energy and may induce a superradiance, as known previously for circular orbits. In addition, we find that the superradiance may be suppressed when the orbital plane inclines with respect to the equatorial plane of the central black hole. We also investigate the accuracy of the 4PN formulae by comparing to numerical results. If we require that the relative errors in the 4PN formulae are less than $10^{-5}$, the parameter region to satisfy the condition will be $p\gtrsim 50$ for $e=0.1$, $p\gtrsim 80$ for $e=0.4$, and $p\gtrsim 120$ for $e=0.7$ almost irrespective of the inclination angle nor the spin of the black hole, where $p$ and $e$ are the semi-latus rectum and the eccentricity of the orbit. The region can further be extended using an exponential resummation method to $p\gtrsim 40$ for $e=0.1$, $p\gtrsim 60$ for $e=0.4$, and $p\gtrsim 100$ for $e=0.7$. Although we still need the higher order calculations of the PN approximation and the expansion with respect to the orbital eccentricity to apply for data analysis of gravitational waves, the results in this paper would be an important improvement from the previous work at the 2.5PN order, especially for large $p$ region.

arXiv comment32 pages, 6 figures, minor corrections, minor modifications to match the published version in PTEP added, supplementary data files available at http://www2.yukawa.kyoto-u.ac.jp/~misao.sasaki/BHPC/

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