Horizon Mechanics and Asymptotic Symmetries with a Immirzi-like   Parameter in 2+1 Dimensions
  Starting with a generalized theory of 2+1 gravity containing an Immirzi like parameter, we derive the modified laws of black hole mechanics using the formalism of weak isolated horizons. Definitions of horizon mass and angular momentum emerge naturally in this framework. We further go on to analyze the asymptotic symmetries, as first discussed by Brown and Henneaux, and analyze their implications in a completely covariant phase space framework. 
Rudranil Basu and Ayan Chatterjee
gr-qc