Higher-dimensional Rotating Charged Black Holes

TL;DR

This paper employs the blackfold approach to construct and analyze new higher-dimensional rotating charged black holes with various topologies and charges, revealing potential instabilities and topological constraints.

Contribution

It introduces a novel application of the blackfold method to charged black holes with string dipoles and develops the dynamics of anisotropic fluids with string currents.

Findings

Explicit solutions for charged rotating black holes with spherical and non-spherical horizons.

Identification of new black ring solutions with string dipoles.

Indications of instabilities in near-extremal, slowly rotating charged black holes.

Abstract

Using the blackfold approach, we study new classes of higher-dimensional rotating black holes with electric charges and string dipoles, in theories of gravity coupled to a 2-form or 3-form field strength and to a dilaton with arbitrary coupling. The method allows to describe not only black holes with large angular momenta, but also other regimes that include charged black holes near extremality with slow rotation. We construct explicit examples of electric rotating black holes of dilatonic and non-dilatonic Einstein-Maxwell theory, with horizons of spherical and non-spherical topology. We also find new families of solutions with string dipoles, including a new class of prolate black rings. Whenever there are exact solutions that we can compare to, their properties in the appropriate regime are reproduced precisely by our solutions. The analysis of blackfolds with string charges requires the formulation of the dynamics of anisotropic fluids with conserved string-number currents, which is new, and is carried out in detail for perfect fluids. Finally, our results indicate new instabilities of near-extremal, slowly rotating charged black holes, and motivate conjectures about topological constraints on dipole hair.