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.
X+X− → 0 [17–19] and the singularity is resolved
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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.