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The Ba\~nados-Teitelboim-Zanelli (BTZ) black hole metric solves thethree-dimensional Einstein's theory with a negative cosmological constant aswell as all the generic higher derivative gravity theories based on the metric;as such it is a universal solution. Here, we find, in all generic higherderivative gravity theories, new universal non-Einsteinian solutions obtainedas Kerr-Schild type deformations of the BTZ black hole. Among these, thedeformed non-extremal BTZ black hole loses its event horizon while the deformedextremal one remains intact as a black hole in any generic gravity theory.

Non-Einsteinian Black Holes in Generic 3D Gravity Theories