Black Holes in Higher Dimensions (Black Strings and Black Rings)

TL;DR

This paper reviews recent advances in higher-dimensional black objects, including new solutions, numerical analyses, and physical properties, with a focus on black strings, black rings, and super-entropic black holes.

Contribution

It summarizes recent developments in higher-dimensional black objects, highlighting new solutions, numerical methods, and physical insights in Einstein and Lovelock gravity.

Findings

Discovery of new families of black objects via blackfold and numerical methods

Observation of oscillating patterns in nonuniform black strings

Approach towards the double-cone merger solution

Abstract

The last three years have again seen new exciting developments in the area of higher dimensional black objects. For black objects with noncompact higher dimensions, the solution space was exlored further within the blackfold approach and with numerical schemes, yielding a large variety of new families of solutions, while limiting procedures created so-called super-entropic black holes. Concerning compact extra dimensions, the sequences of static nonuniform black strings in five and six dimensions were extended to impressively large values of the nonuniformity parameter with extreme numerical precision, showing that an oscillating pattern arises for the mass, the area or the temperature, while approaching the conjectured double-cone merger solution. Besides the presentation of interesting new types of higherdimensional solutions, also their physical properties were addressed in this session. While the main focus was on Einstein gravity, a significant number of talks also covered Lovelock theories.