Reissner-Nordstr\"om dyonic black holes with gauged scalar hair

TL;DR

This paper demonstrates the existence of dyonic black holes with gauged scalar hair in Einstein-Maxwell theory, extending previous electrically charged solutions to include magnetic charge and revealing unique properties such as the absence of a solitonic limit.

Contribution

It introduces new dyonic black hole solutions with gauged scalar hair, including magnetic charge, and analyzes their properties within Einstein-Maxwell theory.

Findings

Dyonic solutions share properties with electrically charged ones.

Existence of a mass gap compared to Reissner-Nordström black holes.

No solitonic limit for non-zero magnetic charge.

Abstract

For gauged scalar fields minimally coupled to Einstein-Maxwell theory, the Mayo-Bekenstein no-hair theorem can be circumvented when including appropriate scalar self-interactions, allowing static, electrically charged black holes to be endowed with (Abelian) gauged scalar hair. Here we show these spherically symmetric solutions can be extended to include a magnetic charge in a model with scalar multiplets. The resulting dyonic configurations share most of the properties of the electrically charged solutions, in particular satisfying the same {\it resonance} condition, with the existence of a mass gap with respect to the bald Reissner-Nordstr\"om dyonic black holes. A distinctive feature, however, is that no solitonic limit exists for a non-zero magnetic charge.