Spherical and Circular Non-Equatorial Photon Orbits around Kerr Black Holes  

作　　者：Leo Morgovsky Leo Morgovsky(Johann Wolfgang Goethe-Universitä,t Frankfurt am Main, Frankfurt, Germany)

机构地区：[1]Johann Wolfgang Goethe-Universitä,t Frankfurt am Main, Frankfurt, Germany

出　　处：《Journal of High Energy Physics, Gravitation and Cosmology》2023年第3期888-896,共9页高能物理（英文）

摘　　要：By analytically solving the equation of azimuthal null geodesics for spherical photon trajectories, a parametric representation of the corresponding segment of the orbit is obtained. The solution parameter is the latitude coordinate. The dependences of the orbital radius on the black hole spinning parameter and the angle of inclination of its plane with respect to the rotation axis are calculated for flat circular non-equatorial orbits. It is proved that all spherical photon trajectories in the Kerr spacetime are unstable, as well as equatorial ones, and the critical photon orbits in the Schwarzschild metric.By analytically solving the equation of azimuthal null geodesics for spherical photon trajectories, a parametric representation of the corresponding segment of the orbit is obtained. The solution parameter is the latitude coordinate. The dependences of the orbital radius on the black hole spinning parameter and the angle of inclination of its plane with respect to the rotation axis are calculated for flat circular non-equatorial orbits. It is proved that all spherical photon trajectories in the Kerr spacetime are unstable, as well as equatorial ones, and the critical photon orbits in the Schwarzschild metric.

关 键 词：Black Holes Kerr Metric Photon Trajectories Null Geodesics Orbits Instability 

分 类 号：O17[理学—数学]