Cosmic censorship conjecture in a general Kerr-Newman black hole

TL;DR

This paper investigates conditions under which the cosmic censorship conjecture might be violated in Kerr-Newman black holes, considering various factors like charge, angular momentum, and probe parameters, and finds violations are only possible under fine-tuned, near-extremal conditions.

Contribution

It provides a detailed analysis of the parameter space where cosmic censorship can be violated in Kerr-Newman black holes, incorporating effects of probes and the hoop conjecture.

Findings

Violations occur only for near-extremal black holes with fine-tuned parameters.

Large numbers of particles or field quanta prevent violation, respecting cosmic censorship.

The relative sign of charge and rotation influences the violation conditions.

Abstract

Using some probes, the violation of cosmic censorship conjecture in a general Kerr-Newman black hole is investigated. The result depends on many factors, like the relative sign of charge and rotation direction of the probe and black hole. Moreover the comparison of the angular momentum of the black hole and its charge has an impressive effect. Considering all these together, we have found the range of the angular momentum, energy and charge of the probe for which the event horizon disappears. We have found that cosmic censorship conjecture violation is possible only for near extremal black hole if the parameters of the probe are too large and fine tuned. Taking into account the hoop conjecture, we see that the cosmic censorship conjecture is respected for a general Kerr-Newman black hole subject to a large enough number of falling particles and also field quanta.