Ida D
Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Phys Rev Lett. 2000 Oct 30;85(18):3758-60. doi: 10.1103/PhysRevLett.85.3758.
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.
（2+1）维引力中已知黑洞解的一个共同特性是它们需要一个负的宇宙学常数。为了解释这一点，本文证明了一个满足主导能量条件的（2+1）维引力理论禁止黑洞的存在。
