Asymptotic symmetries of three-dimensional gravity coupled to higher-spin fields
arXiv:1008.4744 · doi:10.1007/JHEP11(2010)007
Abstract
We discuss the emergence of W-algebras as asymptotic symmetries of higher-spin gauge theories coupled to three-dimensional Einstein gravity with a negative cosmological constant. We focus on models involving a finite number of bosonic higher-spin fields, and especially on the example provided by the coupling of a spin-3 field to gravity. It is described by a SL(3) \times SL(3) Chern-Simons theory and its asymptotic symmetry algebra is given by two copies of the classical W_3-algebra with central charge the one computed by Brown and Henneaux in pure gravity with negative cosmological constant.
38 pages; version to be published in JHEP; typos corrected in eqs. (2.9) and (2.54)