Static Orbits in Rotating Spacetimes

Phys Rev Lett. 2018 May 18;120(20):201103. doi: 10.1103/PhysRevLett.120.201103.

Abstract

We show that under certain conditions an axisymmetric rotating spacetime contains a ring of points in the equatorial plane, where a particle at rest with respect to an asymptotic static observer remains at rest in a static orbit. We illustrate the emergence of such orbits for boson stars. Further examples are wormholes, hairy black holes, and Kerr-Newman solutions.