Weak Cosmic Censorship: As Strong as Ever

TL;DR

This paper reexamines scenarios where black holes might be overspun by scalar particles, demonstrating that accounting for back reaction effects upholds the weak cosmic censorship conjecture and prevents exposing singularities.

Contribution

It shows that considering back reaction effects preserves the stability of black hole horizons, reaffirming the validity of the weak cosmic censorship conjecture in extreme cases.

Findings

Back reaction effects prevent overspinning of black holes.

Event horizons remain stable when back reaction is included.

Cosmic censorship is upheld in thought experiments involving scalar particles.

Abstract

Spacetime singularities that arise in gravitational collapse are always hidden inside of black holes. This is the essence of the weak cosmic censorship conjecture. The hypothesis, put forward by Penrose 40 years ago, is still one of the most important open questions in general relativity. In this Letter, we reanalyze extreme situations which have been considered as counterexamples to the weak cosmic censorship conjecture. In particular, we consider the absorption of scalar particles with large angular momentum by a black hole. Ignoring back reaction effects may lead one to conclude that the incident wave may overspin the black hole, thereby exposing its inner singularity to distant observers. However, we show that when back reaction effects are properly taken into account, the stability of the black-hole event horizon is irrefutable. We therefore conclude that cosmic censorship is actually respected in this type of gedanken experiments.