arXiv:hep-th/9204099hep-th
The Black Hole in Three Dimensional Space Time
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Abstract
The standard Einstein-Maxwell equations in 2+1 spacetime dimensions, with a negative cosmological constant, admit a black hole solution. The 2+1 black hole -characterized by mass, angular momentum and charge, defined by flux integrals at infinity- is quite similar to its 3+1 counterpart. Anti-de Sitter space appears as a negative energy state separated by a mass gap from the continuous black hole spectrum. Evaluation of the partition function yields that the entropy is equal to twice the perimeter length of the horizon.
Isn't 2+1 dimensions gravity a thing ? https://arxiv.org/abs/hep-th/9204099v3
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