Concentric Black Rings

TL;DR

This paper introduces new supersymmetric five-dimensional black ring solutions with concentric configurations, revealing diverse horizon areas and suggesting they lack closed timelike curves, thus expanding understanding of black hole geometries.

Contribution

It presents novel supersymmetric black ring solutions with concentric arrangements and compares their properties to black holes, highlighting their potential for varied horizon areas.

Findings

Black rings can have the same charges as a black hole

Black rings can have smaller, equal, or larger horizon areas than black holes

Numerical analysis suggests absence of closed timelike curves in these solutions

Abstract

We present new supersymmetric solutions of five-dimensional minimal supergravity that describe concentric black rings with an optional black hole at the common centre. Configurations of two black rings are found which have the same conserved charges as a single rotating black hole; these black rings can have a total horizon area less than, equal to, or greater than the black hole with the same charges. A numerical investigation of these particular black ring solutions suggests that they do not have closed timelike curves.