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Covariant equations of motion of extended bodies with arbitrary mass and spin multipoles

Sergei M. Kopeikin*

  • Department of Physics & Astronomy, University of Missouri, 322 Physics Building, Columbia, Missouri 65211, USA

  • *kopeikins@missouri.edu
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Phys. Rev. D 99, 084008 – Published 9 April, 2019

DOI: https://doi.org/10.1103/PhysRevD.99.084008

Abstract

Gravitational wave detectors allow us to test general relativity and to study the internal structure and orbital dynamics of neutron stars and black holes in inspiralling binary systems with a potentially unlimited rigor. Currently, analytic calculations of a gravitational wave signal emitted by inspiralling compact binaries are based on the numerical integration of the asymptotic post-Newtonian expansions of the equations of motion in a pole-dipole approximation that includes masses and spins of the bodies composing the binary. Further progress in the accurate construction of gravitational wave templates of the compact binaries strictly depends on our ability to significantly improve the theoretical description of gravitational dynamics of extended bodies by taking into account the higher-order (quadrupole, octupole, etc.) multipoles in equations of motion of the bodies both in the radiative and conservative approximations of general relativity and other viable alternative theories of gravity. This paper employs the post-Newtonian approximations of a scalar-tensor theory of gravity along with the mathematical apparatus of the Cartesian symmetric trace-free tensors and the Blanchet-Damour multipole formalism to derive translational and rotational equations of motion of N-extended bodies having arbitrary distribution of mass and velocity of matter. We assume that a spacetime manifold can be covered globally by a single coordinate chart which asymptotically goes over to the Minkowskian coordinate chart at spatial infinity. We also introduce N local coordinate charts adapted to each body and covering a finite domain of space around the body. The gravitational field in the neighborhood of each body is parametrized by an infinite set of mass and spin multipoles of the body as well as by the set of tidal gravitoelectric and gravitomagnetic multipoles of external N−1 bodies. The origin of the local coordinates is set moving along the accelerated worldline of the center of mass of the corresponding body by an appropriate choice of the internal and external dipole moments of the gravitational field. Translational equations of motion of the body’s center of mass and rotational equations of motion for its spin are derived by integrating microscopic equations of motion of the body’s matter and applying the method of the asymptotic matching technique to splice together the post-Newtonian solutions of the field equations of the scalar-tensor theory of gravity for the metric tensor and scalar field obtained in the global and local coordinate charts. The asymptotic matching is also used for separating the post-Newtonian self-field effects from the external gravitational environment and constructing the effective background spacetime manifold. It allows us to present the equations of translational and rotational motion of each body in covariant form by making use of the Einstein principle of equivalence. This relaxes the slow-motion approximation and makes the covariant post-Newtonian equations of motion of extended bodies with weak self-gravity applicable for the case of relativistic speeds. Though the covariant equations of the first post-Newtonian order are still missing terms from the second post-Newtonian approximation, they may be instrumental in getting a glimpse of the last several orbital revolutions of stars in an ultracompact binary system just before merging. Our approach significantly generalizes the Mathisson-Papapetrou-Dixon covariant equations of motion with regard to the number of the body’s multipoles and the post-Newtonian terms having been taken into account. The equations of translational and rotational motion derived in the present paper include the entire infinite set of covariantly defined mass and spin multipoles of the bodies. Thus, they can be used for a much more accurate prediction of orbital dynamics of tidally deformed stars in inspiralling binary systems and construction of templates of gravitational waves at the merger stage of a coalescing binary when the strong tidal distortions and gravitational coupling of higher-order mass and spin multipoles of the stars play a dominant role in the last few seconds of the binary life.

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Phys. Rev. D 99, 084008– Published 9 April, 2019
  • Received 29 October 2018
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