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Deviation of quadrupolar bodies from geodesic motion in a Kerr spacetime

Donato Bini

Andrea Geralico

  • Istituto per le Applicazioni del Calcolo “M. Picone,” CNR, I-00185 Rome, Italy and ICRA, “Sapienza” University of Rome, I-00185 Rome, Italy

  • Physics Department and ICRA, “Sapienza” University of Rome, I-00185 Rome, Italy

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Phys. Rev. D 89, 044013 – Published 18 February, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.044013

Abstract

The deviation from geodesic motion of the world line of an extended body endowed with multipolar structure up to the mass quadrupole moment is studied in the Kerr background according to the Mathisson-Papapetrou-Dixon model. The properties of the quadrupole tensor are clarified by identifying the relevant components which enter the equations of motion, leading to the definition of an effective quadrupole tensor sharing its own algebraic symmetries, but also obeying those implied by the Mathisson-Papapetrou-Dixon model itself. The equations of motion are then solved analytically in the limit of small values of the characteristic length scales associated with the spin and quadrupole variables in comparison with the one associated with the background curvature and under special assumptions on the body’s structure and motion. The resulting quasicircular orbit is parametrized in a Keplerian-like form, so that temporal, radial, and azimuthal eccentricities as well as semimajor axis, period, and periastron advance are explicitly computed and expressed in terms of gauge-invariant variables in the weak field and slow motion limit. A companion numerical study of the equations of motion is performed too.

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Phys. Rev. D 89, 044013– Published 18 February, 2014
  • Received 29 November 2013

© 2014 American Physical Society

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