Abstract
In (2+1) space-time dimensions the Einstein theory of gravity has no local degrees of freedom. In fact, in the presence of a negative cosmological term, it is described by a (1+1) dimensional theory living on its boundary: Liouville theory. It is invariant under the action of the two-dimensional conformal group, which, in the gravitational context, corresponds to the asymptotic symmetries of asymptotically AdS geometries. In the flat case, when the cosmological term is turned off, a theory describing gravity at the boundary is absent. In this note we show that, in the Hamiltonian setup, such a theory may be constructed. The theory is BMS3 invariant, as it should, corresponding to the asymptotic symmetry group of an asymptotically flat spacetime.
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Notes
- 1.
Note however that, as discussed in [9], this equivalence generally holds only up to zero modes.
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Acknowledgements
The work of G.B. is supported in part by the Fund for Scientific Research-FNRS (Belgium), by the Belgian Federal Science Policy Office through the Interuniversity Attraction Pole P6/11, by IISN-Belgium, by “Communauté française de Belgique—Actions de Recherche Concertées” and by Fondecyt Projects No. 1085322 and No. 1090753. The work of A.G. was partially supported by Fondecyt (Chile) Grant #1090753. H.G. thanks Conicyt for financial support.
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Barnich, G., Gomberoff, A., González, H.A. (2014). A 2D Field Theory Equivalent to 3D Gravity with No Cosmological Constant. In: García-Parrado, A., Mena, F., Moura, F., Vaz, E. (eds) Progress in Mathematical Relativity, Gravitation and Cosmology. Springer Proceedings in Mathematics & Statistics, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40157-2_11
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DOI: https://doi.org/10.1007/978-3-642-40157-2_11
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