Degenerate black rings in D=5 minimal supergravity

We consider both gauged and ungauged minimal supergravities in five dimensions and analyse the charged rotating solutions with two equal angular momenta J. When the electric charge Q similar to J(2/3) with some specific coefficient, we find new extremal black objects emerge that are asymptotic to either Minkowski or global AdS spacetimes and can be best described as degenerate black rings. Their near-horizon geometry is locally AdS(3) x S-2, where the periodic U(1) fibre coordinate in S-3 untwists and collapses to be the degenerate part of the AdS(3) horizon. It turns out that there are two branches of extremal rotating black holes, starting as the extremal RN black holes of the same mass, but opposite charges. With the increasing of the angular momentum, they will join to become the same degenerate black ring, where the Gibbs free energies however are not continuous at the joining. For the same Q(J) relation, we find that there is in addition a rotating soliton whose mass is smaller than that of the degenerate black ring.

Automated summary

In this study, we analyze charged rotating solutions in both gauged and ungauged minimal supergravities in five dimensions, with a focus on cases where the electric charge Q is proportional to J(2/3). We discover new extremal black objects that are asymptotic to either Minkowski or global AdS spacetimes, best described as degenerate black rings. These objects have a near-horizon geometry of locally AdS(3) x S-2, with two branches of rotating black holes joining to become the same degenerate black ring as the angular momentum increases.