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• W4307642267 abstract "We study the null and time-like geodesics of the light and the neutral particles respectively in the exterior of Kerr-Newman black holes. The geodesic equations are known to be written as a set of first-order differential equations in Mino time from which the angular and radial potentials can be defined. We classify the roots for both potentials, and mainly focus on those of the radial potential with an emphasis on the effect from the charge of the black holes. We then obtain the solutions of the trajectories in terms of the elliptical integrals and the Jacobian elliptic functions for both null and time-like geodesics, which are manifestly real functions of the Mino time that the initial conditions can be explicitly specified. We also describe the details of how to reduce those solutions into the cases of the spherical orbits. The effect of the black hole's charge decreases the radii of the spherical motion of the light and the particle for both direct and retrograde motions. In particular, we focus on the light/particle boomerang of the spherical orbits due to the frame dragging from the back hole's spin with the effect from the charge of the black hole. To sustain the change of the azimuthal angle of the light rays, say for example $Delta phi=pi$ during the whole trip, the presence of the black hole's charge decreases the radius of the orbit and consequently reduces the needed values of the black hole's spin. As for the particle boomerang, the particle's inertia renders smaller change of the angle $Delta phi$ as compared with the light boomerang. Moreover, the black hole's charge also results in the smaller angle change $Delta phi$ of the particle than that in the Kerr case. The implications of the obtained results to observations are discussed." @default.
• W4307642267 created "2022-11-04" @default.
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• W4307642267 date "2022-10-27" @default.
• W4307642267 modified "2023-09-23" @default.
• W4307642267 title "Null and timelike geodesics in the Kerr-Newman black hole exterior" @default.
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• W4307642267 doi "https://doi.org/10.1103/physrevd.106.084048" @default.
• W4307642267 hasPublicationYear "2022" @default.
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