Extremal Black Hole Horizons

TL;DR

This paper uses the blackfold effective theory to predict new extremal black hole solutions with disconnected horizons in higher-dimensional spacetimes, expanding the known landscape of black hole configurations.

Contribution

It introduces novel extremal black hole solutions with disconnected horizons in higher dimensions, including black rings, saturns, di-rings, and bi-rings, some of which are the first of their kind in vacuum Einstein gravity.

Findings

Existence of extremal doubly-spinning black rings in five dimensions

Construction of extremal black saturns, di-rings, and bi-rings in higher dimensions

First examples of extremal disconnected horizons in vacuum Einstein gravity

Abstract

Using the blackfold effective theory applied to extremal Kerr branes we provide evidence for the existence of new stationary extremal black hole solutions in asymptotically flat spacetime with both single and multiple disconnected horizons. These include extremal doubly-spinning black rings, black saturns, di-rings and bi-rings in five spacetime dimensions as well as extremal Myers-Perry black holes and black saturns in dimensions greater than five. Some of these constructions constitute the first examples of black hole solutions with extremal disconnected horizons in vacuum Einstein gravity.