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- W4300772254 abstract "We explore how the internal structure of a test particle affects its equatorial stable circular orbits around the Kerr black hole with or without a cosmological constant. To this end, we first explicitly write equations of motion for a test particle in the pole-dipole-quadrupole approximation specifying the quadrupole momentum tensor to a spin-induced model. Then we calculate characteristic quantities -- radius, angular momentum, energy, angular velocity, and impact parameter -- for the particles on the stable circular orbits. Once the pole-dipole-quadrupole approximation is taken, we find that for a particle on an innermost stable circular orbit, all characteristic quantities, except the angular velocity, become greater relative to the pole-dipole case. In contrast, for a particle on an outermost stable circular orbit, which only exists in the case of the spacetime background being asymptotically de Sitter, it is the radius that becomes smaller while all other quantities become greater." @default.
- W4300772254 created "2022-10-04" @default.
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- W4300772254 date "2022-11-01" @default.
- W4300772254 modified "2023-10-01" @default.
- W4300772254 title "Internal structures and circular orbits for test particles" @default.
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- W4300772254 doi "https://doi.org/10.1016/j.physletb.2022.137476" @default.
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