Weak cosmic censorship: as strong as ever

Area of Science:

• Theoretical Physics
• General Relativity
• Black Hole Physics

Background:

• The weak cosmic censorship conjecture posits that singularities in gravitational collapse are always concealed within black holes.
• This conjecture, proposed by Penrose, remains a pivotal unresolved issue in general relativity.
• Certain extreme scenarios, such as scalar particle absorption by black holes, have been proposed as potential counterexamples.

Purpose of the Study:

• To reanalyze scenarios previously considered counterexamples to the weak cosmic censorship conjecture.
• To investigate the impact of back reaction effects on black hole stability during extreme events.
• To determine if cosmic censorship is upheld under these conditions.

Main Methods:

• Analysis of scalar particle absorption by black holes, specifically focusing on particles with large angular momentum.
• Inclusion and detailed examination of back reaction effects, which are often ignored in simplified models.
• Theoretical investigation of the stability of the black hole event horizon.

Main Results:

• Ignoring back reaction effects can misleadingly suggest that a black hole might overspin and expose its singularity.
• When back reaction effects are accurately incorporated, the stability of the black hole event horizon is robustly demonstrated.
• The analysis indicates that the event horizon remains stable, preventing singularity exposure.

Conclusions:

• The study concludes that the weak cosmic censorship conjecture is respected in the analyzed gedanken experiments.
• Proper consideration of back reaction effects is crucial for accurately assessing black hole behavior and event horizon stability.
• The findings reinforce the principle that singularities within black holes remain hidden from external observers.