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

TL;DR

This paper explores the quantization of 3D gravity with positive cosmological constant in Loop Quantum Gravity, proposing a physical state ansatz that aligns with Turaev-Viro model expectations and addresses constraint algebra anomalies.

Contribution

It introduces a novel ansatz for physical states in LQG for positive mbda, linking to Turaev-Viro and handling constraint anomalies.

Findings

Transition amplitudes consistent with Turaev-Viro model

Physical state annihilates the master constraint at first order in mbda

Addresses anomaly in the constraints algebra

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}.