2014

Extended bodies in a Kerr spacetime: exploring the role of a general quadrupole tensor

Bini, Donato, Geralico, Andrea

Understand

The equatorial motion of extended bodies in a Kerr spacetime is investigated in the framework of the Mathisson-Papapetrou-Dixon model, including the full set of effective components of the quadrupole tensor.

The numerical integration of the associated equations shows the specific role of the mass and current quadrupole moment components.
While most of the literature on this topic is limited to spin-induced (purely electric) quadrupole tensor, the present analysis highlights the effect of a completely general quadrupole tensor on the dynamics.
The contribution of the magnetic-type components is indeed related to a number of interesting features, e.g., enhanced inward/outward spiraling behavior of the orbit and spin-flip-like effects, which may have observational counterparts.

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