Numerical collapse in 4+1D vacuum gravity with Λ>0 forms a Schwarzschild–de Sitter black hole at 99% of the extremal mass, suggesting the extremal limit — and a third-law violation — may be reachable.
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Near--extremal gravitational collapse in 4+1 dimensions: Schwarzschild--de--Sitter space
Numerical collapse in 4+1D vacuum gravity with Λ>0 forms a Schwarzschild–de Sitter black hole at 99% of the extremal mass, suggesting the extremal limit — and a third-law violation — may be reachable.