# Overspinning BTZ black holes with test particles and fields

## TL;DR

This paper investigates whether nearly extremal BTZ black holes can be overspun using test particles and fields, revealing that overspinning is possible under certain conditions, challenging previous claims of cosmic censorship.

## Contribution

It extends prior analysis by showing that massive test particles and test fields can overspin nearly extremal BTZ black holes, including extremal cases, regardless of superradiance presence.

## Key findings

- Massive test particles can overspin nearly extremal BTZ black holes.
- Test fields can overspin nearly extremal black holes regardless of superradiance.
- Overspinning of extremal black holes is possible, challenging previous results.

## Abstract

It has been claimed that in a test of an asymptotically AdS version of weak cosmic censorship conjecture by attempting to overspin a BTZ black hole with test particles, one finds that it is not possible to spin-up the black hole past its extremal limit. The result of this analysis is restricted to the case where the initial black hole is extremal. We extend this analysis to find that massive test particles can overspin the black hole, if we start with a nearly extremal black hole, instead. We also consider the interaction of the BTZ black hole with test fields. We show that overspinning of nearly extremal black holes is possible whether or not there is superradiance for the field. If there is superradiance, overspinning occurs in a narrow range of frequencies bounded below by the super-radiant limit. However, if there is no superradiance for the field, overspinning becomes generic and also applies to extremal black holes. This is in analogy with the Kerr case.