伊形 尚久

We show that there exist chaotic bound orbits of a particle around a singly rotating black ring in five-dimensions by using Poincaré map.

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 addition, radii of stable bound orbits can be infinitely large if the ring thickness is less than a critical value.