For the spherically reduced 2D semiclassical gravity model in the Boulware state, choosing a negative central charge eliminates the curvature singularity and leaves a regular horizonless spacetime.
Jackiw, Liouville field theory: A two-dimensional model for gravity?, in Quantum Theory of Gravity , edited S.M
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Singularity resolution in spherically reduced 2D semiclassical gravity with negative central charge
For the spherically reduced 2D semiclassical gravity model in the Boulware state, choosing a negative central charge eliminates the curvature singularity and leaves a regular horizonless spacetime.