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arxiv: 1211.2631 · v2 · pith:N5IORVP2new · submitted 2012-11-12 · 🌀 gr-qc

Destroying extremal Kerr-Newman black holes with test particles

classification 🌀 gr-qc
keywords blackextremalholecensorshipcosmicparticletestviolation
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It has been shown that a nearly extremal black hole can be overcharged or overspun by a test particle if radiative and self-force effects are neglected, indicating that the cosmic censorship might fail. In contrast, the existing evidence in literature suggests that an extremal black hole cannot be overcharged or overspun in a similar process. In this paper, we show explicitly that even an exactly extremal black hole can be destroyed by a test particle, leading to a possible violation of the cosmic censorship. By considering higher order terms, which were neglected in previous analysis, we show that the violation is generic for any extremal Kerr-Newman black hole with nonvanishing charge and angular momentum. We also find that the allowed parameter range for the particle is very narrow, indicating that radiative and self-force effects should be considered and may prevent violation of the cosmic censorship.

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  1. Trapped Surface as a Cosmic Censor

    gr-qc 2026-06 unverdicted novelty 7.0

    A trapped-surface criterion, derived under null convergence and generic conditions, rules out superextremal Reissner-Nordström, Kerr-Newman, and related final states in overcharging thought experiments without using a...