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
        }
}
  • Ida
  • Published 31 May 2000
  • Physics, Medicine
  • Physical review letters
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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