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Does anyone have any references that discuss gravity in three-dimensions? I'm trying to make my way through some papers by Witten relating $SL(2,\mathbb{C})$ Chern-Simons theory and gravity in three spacetime dimensions and would like some explanation about the latter of the two topics.

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Before answering, please see our policy on resource recommendation questions. Please write substantial answers that detail the style, content, and prerequisites of the book, paper or other resource. Explain the nature of the resource so that readers can decide which one is best suited for them rather than relying on the opinions of others. Answers containing only a reference to a book or paper will be removed!

Please tell us which papers you have in mind precisely so that we don't give you references you already have. There's e.g. this and this – Marek May 14 '11 at 10:21
Yes, those are precisely the two papers I'm starting with. I'm wondering if there are any papers/books which lay out GR in 3 spacetime dimensions. I am only familiar with Carroll's book, Wald, and MTW. I have seen Carlip's book, but still waiting for it to be returned to the library. – klw1026 May 14 '11 at 16:02

The t'Hooft references started the modern field, and they are in my opinion the best for first learning the subject, because they are self-contained and they allow a full simulation of the classical dynamics. These are taken from t'Hooft's web page:

The last paper is available online, and gives a complete numerical implementation and numerical results.

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Steve Carlip wrote a book, quantum gravity in 2+1 dimension. He also has a review article on Living Review.

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