A (Running) Bolt for New Reasons

TL;DR

This paper constructs new smooth, horizonless solutions in five-dimensional supergravity using Euclidean Schwarzschild and Kerr-Taub-Bolt metrics, suggesting a potential resolution to black hole singularities.

Contribution

It introduces a family of non-static, horizonless solutions called 'running Bolt' solutions, expanding the landscape of known supergravity configurations.

Findings

Solutions have the same charges and mass as non-extremal black holes.

Mass can decrease as charges increase in certain regimes.

Supports the idea that black hole singularities are resolved by low-mass modes.

Abstract

We construct a four-parameter family of smooth, horizonless, stationary solutions of ungauged five-dimensional supergravity by using the four-dimensional Euclidean Schwarzschild metric as a base space and "magnetizing" its bolt. We then generalize this to a five-parameter family based upon the Euclidean Kerr-Taub-Bolt. These "running Bolt" solutions are necessarily non-static. They also have the same charges and mass as a non-extremal black hole with a classically-large horizon area. Moreover, in a certain regime their mass can decrease as their charges increase. The existence of these solutions supports the idea that the singularities of non-extremal black holes are resolved by low-mass modes that correct the singularity of the classical black hole solution on large (horizon-sized) scales.