2+1 gravity with positive cosmological constant in LQG: a proposal for the physical state

Abstract : In this paper, I investigate the possible quantization, in the context of LQG, of three dimensional gravity in the case of positive cosmological constant {\Lambda} and try to make contact with alternative quantization approaches already existing in the literature. Due to the appearance of an anomaly in the constraints algebra, previously studied as a first step of the analysis, alternative techniques developed for the quantization of systems with constraints algebras not associated with a structure Lie group need to be adopted. Therefore, I introduce an ansatz for a physical state which gives some transition amplitudes in agreement with what one would expect from the Turaev-Viro model. Moreover, in order to check that this state implements the right dynamicss, I show that it annihilates the master constraint for the theory up to the first order in {\Lambda}.
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Daniele Pranzetti. 2+1 gravity with positive cosmological constant in LQG: a proposal for the physical state. Classical and Quantum Gravity, IOP Publishing, 2011, 28 (22), pp.225025. ⟨10.1088/0264-9381/28/22/225025⟩. ⟨hal-00963693⟩

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