Effect of gravitational radiation reaction on circular orbits around a spinning black hole

Details Effect of gravitational radiation reaction on circular orbits around a spinning black hole Effect of gravitational radiation reaction on circular orbits around a spinning black hole

1995-06-08

arxiv.org/abs/gr-qc/9506023v1

Phys.Rev.D52:3159-3162,1995

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages

Scientific paper

10.1103/PhysRevD.52.R3159

The effect of gravitational radiation reaction on circular orbits around a spinning (Kerr) black hole is computed to leading order in $S$ (the magnitude of the spin angular momentum of the hole) and in the strength of gravity $M/r$ (where $M$ is the mass of the black hole, $r$ is the orbital radius, and $G=c=1$). The radiation reaction makes the orbit shrink but leaves it circular, and drives the orbital plane very slowly toward antialignment with the spin of the hole: $\tan (\iota /2) = \tan (\iota_0 /2) [1+(61/72)(S/M^2) (M/r)^{3/2}]$, where $\iota$ is the angle between the normal to the orbital plane and the spin direction, and $\iota_0$ is the initial value of $\iota$, when $r$ is very large.

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