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The Carter constant for inclined orbits about a massive Kerr black hole: near-circular, near-polar orbits

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Komorowski P., Valluri S., Houde M.

Open Physics

2012

vol. 10

issue 4

799-820

In an extreme mass-ratio binary black hole system, a non-equatorial orbit will list (i.e. increase its angle of inclination, i) as it evolves in Kerr spacetime. The abutment, a set of evolving, near-polar, retrograde orbits, for which the instantaneous Carter constant (Q) is at its maximum value (Q X) for given values of latus rectum (l̃) and eccentricity (e), has been introduced as a laboratory in which the consistency of dQ/dt with corresponding evolution equations for d l̃/dt and de/dt might be tested independently of a specific radiation back-reaction model. To demonstrate the use of the abutment as such a laboratory, a derivation of dQ/dt, based only on published formulae for d l̃/dt and de/dt, was performed for elliptical orbits on the abutment. The resulting expression for dQ/dt matched the published result to the second order in e. We believe the abutment is a potentially useful tool for improving the accuracy of evolution equations to higher orders of e and l̃−.

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1 Open Physics

1 2012

1 Houde M.

1 Komorowski P.

1 Valluri S.

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The Carter constant for inclined orbits about a massive Kerr black hole: near-circular, near-polar orbits