On the Boundary Dynamics of Chern-Simons Gravity

Details On the Boundary Dynamics of Chern-Simons Gravity On the Boundary Dynamics of Chern-Simons Gravity

2002-10-09

arxiv.org/abs/hep-th/0210089v2

JHEP 0301 (2003) 067

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, LaTeX2e, v2: JHEP3.cls, references and a footnote added

Scientific paper

10.1088/1126-6708/2003/01/067

We study Chern-Simons theory with a complex G_C or a real G x G gauge group on a manifold with boundary - this includes Lorentzian and Euclidean (anti-) de Sitter (E/A)dS gravity for G=SU(2) or G=SL(2,R). We show that there is a canonical choice of boundary conditions that leads to an unambiguous, fully covariant and gauge invariant, off-shell derivation of the boundary action - a G_C/G or G WZW model, coupled in a gauge invariant way to the boundary value of the gauge field. In particular, for (E/A)dS gravity, the boundary action is a WZW model with target space (E/A)dS_3, reminiscent of a worldsheet for worldsheet mechanism. We discuss in some detail the properties of the boundary theories that arise and we confront our results with various related constructions in the literature.

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