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arXiv · 1312.0775

Gravitational self-torque and spin precession in compact binaries

Sam R. Dolan·Niels Warburton·Abraham I. Harte·Alexandre Le Tiec·Barry Wardell·Leor Barack
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Abstract

We calculate the effect of self-interaction on the "geodetic" spin precession of a compact body in a strong-field orbit around a black hole. Specifically, we consider the spin precession angle $ψ$ per radian of orbital revolution for a particle carrying mass $μ$ and spin $s \ll (G/c) μ^2$ in a circular orbit around a Schwarzschild black hole of mass $M \gg μ$. We compute $ψ$ through $O(μ/M)$ in perturbation theory, i.e, including the correction $δψ$ (obtained numerically) due to the torque exerted by the conservative piece of the gravitational self-field. Comparison with a post-Newtonian (PN) expression for $δψ$, derived here through 3PN order, shows good agreement but also reveals strong-field features which are not captured by the latter approximation. Our results can inform semi-analytical models of the strong-field dynamics in astrophysical binaries, important for ongoing and future gravitational-wave searches.

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Sam R. Dolan, Niels Warburton, Abraham I. Harte, Alexandre Le Tiec, Barry Wardell, Leor Barack. 2014-03-07. Gravitational self-torque and spin precession in compact binaries. https://doi.org/10.1103/physrevd.89.064011

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