Four-charge planar electric AdS black holes in STU supergravity have negative energy-Hessian determinant below a finite critical temperature; with a BPS-shifted energy, supersymmetric magnetic black holes become metastable.
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The Instability of Low-Temperature Black Holes in Gauged $\mathcal{N}=8$ Supergravity
Four-charge planar electric AdS black holes in STU supergravity have negative energy-Hessian determinant below a finite critical temperature; with a BPS-shifted energy, supersymmetric magnetic black holes become metastable.