Poisson structure and symmetry in the Chern-Simons formulation of (2+1)-dimensional gravity

Details Poisson structure and symmetry in the Chern-Simons formulation of (2+1)-dimensional gravity Poisson structure and symmetry in the Chern-Simons formulation of (2+1)-dimensional gravity

2003-01-27

arxiv.org/abs/gr-qc/0301108v1

Class.Quant.Grav. 20 (2003) 2193-2234

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

49 pages amslatex, 7 eps figures

Scientific paper

10.1088/0264-9381/20/11/318

In the formulation of (2+1)-dimensional gravity as a Chern-Simons gauge theory, the phase space is the moduli space of flat Poincar\'e group connections. Using the combinatorial approach developed by Fock and Rosly, we give an explicit description of the phase space and its Poisson structure for the general case of a genus g oriented surface with punctures representing particles and a boundary playing the role of spatial infinity. We give a physical interpretation and explain how the degrees of freedom associated with each handle and each particle can be decoupled. The symmetry group of the theory combines an action of the mapping class group with asymptotic Poincar\'e transformations in a non-trivial fashion. We derive the conserved quantities associated to the latter and show that the mapping class group of the surface acts on the phase space via Poisson isomorphisms.

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