Extremal black holes that are not extremal: maximal warm holes

We study a family of four-dimensional, asymptotically flat, charged black holes that develop (charged) scalar hair as one increases their charge at fixed mass. Surprisingly, the maximum charge for given mass is a nonsingular hairy black hole with nonzero Hawking temperature. The implications for Hawking evaporation are discussed.

Automated summary

This study focuses on a family of charged black holes that develop scalar hair as their charge increases at fixed mass. Surprisingly, the maximum charge for a given mass corresponds to a nonsingular hairy black hole with nonzero Hawking temperature. The implications for Hawking evaporation are discussed.