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(2+1)-dimensional topological gravity

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2+1 Dimensional Gravity Revisited | Edward Witten

In two spatial and one time dimensions, general relativity turns out to have no propagating gravitational degrees of freedom. In fact, it can be shown that in a vacuum, spacetime will always be locally flat. This makes (2+1)-dimensional topological gravity a topological theory with no gravitational local degrees of freedom.
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