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Dynamics of extended bodies in a Kerr spacetime with spin-induced quadrupole tensor

Abstract : The features of equatorial motion of an extended body in Kerr spacetime are investigated in the framework of the Mathisson-Papapetrou-Dixon model. The body is assumed to stay at quasiequilibrium and respond instantly to external perturbations. Besides the mass, it is completely determined by its spin, the multipolar expansion being truncated at the quadrupole order, with a spin-induced quadrupole tensor. The study of the radial effective potential allows us to analytically determine the innermost stable circular orbit shift due to spin and the associated frequency of the last circular orbit.
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Submitted on : Thursday, April 28, 2022 - 2:18:32 PM
Last modification on : Thursday, April 28, 2022 - 2:19:18 PM
Long-term archiving on: : Friday, July 29, 2022 - 7:18:56 PM

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PhysRevD.92.104003.pdf
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Donato Bini, Guillaume Faye, Andrea Geralico. Dynamics of extended bodies in a Kerr spacetime with spin-induced quadrupole tensor. Physical Review D, 2015, 92, ⟨10.1103/PhysRevD.92.104003⟩. ⟨insu-03644692⟩

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