The third law of black hole thermodynamics
A subextremal black hole is a black hole that is not extremal. The third law of black hole thermodynamics. A subextremal black hole cannot become extremal in finite time by any continuous process, no matter how idealized, in which the spacetime and matter fields remain regular and obey the weak energy condition. The paper constructs counterexamples in the Einstein–Maxwell-charged scalar field system, so this formulation of the third law is false.
References
Primary source
Christoph Kehle and Ryan Unger, “Gravitational collapse to extremal black holes and the third law of black hole thermodynamics”, arXiv:2211.15742 (2024).
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