Newtonian gravitational potential sourced by a homogeneous circular ring in arbitrary dimensional Euclidean space takes a simple form if the spatial dimension is even. In contrast, if the spatial dimension is odd, it is given in a form that includ...
Kota Ogasawara Takahisa Igata Tomohiro Harada Umpei Miyamoto
Physical Review D 101(4) 2020年2月 [査読有り]
We investigate the escape of photons from the vicinity of the horizon to infinity in the Kerr-Newman black hole spacetime. We assume that a light source is at rest in a locally nonrotating frame on the equatorial plane and photons are emitted isot...
In higher-dimensional Schwarzschild black hole spacetimes, there are no stable bound orbits of particles. In contrast to this, it is shown that there are stable bound orbits in a five-dimensional black lens spacetime.
We investigate how stable circular orbits around a main compact object appear depending on the presence of a second one by using the Majumdar-Papapetrou dihole spacetime, which consists of the two extremal Reissner-Nordström black holes with diffe...
We consider the escape probability of a photon emitted from the innermost stable circular orbit (ISCO) of a rapidly rotating black hole. As an isotropically emitting light source on a circular orbit reduces its orbital radius, the escape probabili...
Journal of Physics: Conference Series 314 012113-012113 2011年9月 [査読有り]
We study stable bound orbits of a free particle around a black ring. Unlike the higher-dimensional black hole case, we find that there exist stable bound orbits in toroidal spiral shape near the ring axis and stable circular orbits on the axis. In...
人文科学研究科
理学部