Gravity as a constrained BF theory: Noether charges and Immirzi parameter
arXiv:1103.2971 · doi:10.1103/PhysRevD.83.124011
Abstract
We derive and analyze Noether charges associated with the diffeomorphism invariance for the constrained SO(2,3) BF theory. This result generalizes the Wald approach to the case of the first order gravity with a negative cosmological constant, the Holst modification and topological terms (Nieh-Yan, Euler, and Pontryagin). We show that differentiability of the action is automatically implemented by the the structure of the constrained BF model. Finally, we calculate the AdS--Schwarzschild black hole entropy from the Noether charge and we find that, unexpectedly, it does not depend on the Immirzi parameter.
6 pages, discussion in sect. IV extended, references added, typos corrected; to be published in Physical Review D
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