# End Point of the Ultraspinning Instability and Violation of Cosmic Censorship

## TL;DR

This paper investigates the nonlinear evolution of ultraspinning instabilities in six-dimensional Myers-Perry black holes, revealing that they lead to naked singularities and violate cosmic censorship.

## Contribution

It identifies the end state of the ultraspinning instability and demonstrates the formation of naked singularities in higher-dimensional black holes.

## Key findings

- Formation of concentric black rings connected by membranes
- Thinning of membrane segments over time
- Violation of weak cosmic censorship in D=6

## Abstract

We determine the end point of the axisymmetric ultraspinning instability of asymptotically flat Myers-Perry black holes in D = 6 spacetime dimensions. In the non-linear regime, this instability gives rise to a sequence of concentric rings connected by segments of black membrane on the rotation plane. The latter become thinner over time, resulting in the formation of a naked singularity in finite asymptotic time and hence a violation of the weak cosmic censorship conjecture in asymptotically flat higher-dimensional spaces.