On the structure of the ergosurface of Pomeransky-Senkov black rings

Abstract

We study the properties of the ergosurface of the Pomeransky-Senkov black rings, and show that it splits into an "inner"' and an "outer" region. As for the singular set, the topology of the "outer ergosurface" depends upon the value of parameters.Comment: 14 pages, 1 figur