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Gedanken experiments on nearly extremal black holes and the Third Law
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A gedanken experiment in which a black hole is pushed to spin at its maximal rate by tossing into it a test body is considered. After demonstrating that this is kinematically possible for a test body made of reasonable matter, we focus on its implications for black hole thermodynamics and the apparent violation of the third law (unattainability of the extremal black hole). We argue that this is not an actual violation, due to subtleties in the absorption process of the test body by the black hole, which are not captured by the purely kinematic considerations.
Forward citations
Cited by 3 Pith papers
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Trapped Surface as a Cosmic Censor
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...
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Weak Cosmic Censorship Conjecture in Gedanken Experiments at All Orders
At every perturbation order, black hole gedanken experiments preserve cosmic censorship whenever the thermodynamic quantity W is positive.
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The First Law and Weak Cosmic Censorship for de Sitter Black Holes
An Iyer-Wald first law is established for general perturbations of Reissner-Nordstrom-de Sitter black holes, and a second-order Sorce-Wald argument shows that near-extremal such black holes cannot be overcharged under...
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