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Stationary black holes in 5-dimensional Einstein-Maxwell-Chern-Simons theorypossess surprising properties. When considering the Chern-Simons coefficient$\lambda$ as a parameter, two critical values of $\lambda$ appear: thesupergravity value $\lambda_{\rm SG}=1$, and the value $\lambda=2$. At$\lambda=1$, supersymmetric black holes with vanishing horizon angularvelocity, but finite angular momentum exist. As $\lambda$ increases beyond$\lambda_{\rm SG}$ a rotational instability arises, and counterrotating blackholes appear, whose horizon rotates in the opposite sense to the angularmomentum. Thus supersymmetry is associated with the borderline betweenstability and instability. At $\lambda=2$ rotating black holes with vanishingangular momentum emerge. Beyond $\lambda=2$ black holes may possess a negativehorizon mass, while their total mass is positive. Charged rotating black holeswith vanishing gyromagnetic ratio appear, and black holes are no longeruniquely characterized by their global charges.Comment: 15 pages, 16 figures, MPLA style, invited review for Modern Physics  Letters

NON-UNIQUENESS, COUNTERROTATION, AND NEGATIVE HORIZON MASS OF EINSTEIN–MAXWELL–CHERN–SIMONS BLACK HOLES