Living Reviews in RelativityCurrent articles from Living Reviews in Relativity. Living Reviews in Relativity is a peer-refereed, solely online physics journal publishing invited reviews covering all areas of relativity research. Reviews are kept up to date by their authors. All reference information is collected into a searchable database. Living Reviews in Relativity is a free resource to the scientific community. Published by the Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam,...Quantum Gravity in 2+1 Dimensions: The Case of a Closed Universe- January 24, 2005 In three spacetime dimensions, general relativity drastically simplifies, becoming a topological'' theory with no propagating local degrees of freedom. Nevertheless, many of the difficult conceptual problems of quantizing gravity are still present. In this review, I summarize the rather large body of work that has gone towards quantizing (2+1)-dimensional vacuum gravity in the setting of a spatially closed universe.http://www.livingreviews.org/lrr-2005-1 |