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What happens when black holes carry both electric and magnetic charge?

Yu-Xuan Lin, Jia-Zhou Liu, Yu-Xiao Liu

May 18, 2026

Adding a nonminimal coupling between two exotic fields yields an exact black hole solution that carries both electric and magnetic charge while breaking Lorentz symmetry. The shadow cast by such a black hole shifts appreciably depending on the degree of symmetry violation and the charge mix — potentially observable with instruments like the Event Horizon Telescope. The same parameters also reshape the black hole's thermodynamic phase structure, shifting when and how it flips between small and large states.
Published as Dyonic Black Holes in Lorentz-Violating Gravity with a Background Kalb--Ramond Field arXiv:2605.18371
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