# No black-hole theorem in three-dimensional gravity

@article{Ida2000NoBT, title={No black-hole theorem in three-dimensional gravity}, author={Ida}, journal={Physical review letters}, year={2000}, volume={85 18}, pages={ 3758-60 } }

A common property of known black-hole solutions in (2+1)-dimensional gravity is that they require a negative cosmological constant. To explain this, it is shown in this Letter that a (2+1)-dimensional gravity theory which satisfies the dominant energy condition forbids the existence of a black hole.

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