Large-spin asymptotics of Euclidean LQG flat-space wavefunctions

Abstract

We analyze the large-spin asymptotics of a class of spin-network wavefunctions of Euclidean Loop Quantum Gravity, which corresponds to a flat spacetime. A wavefunction from this class can be represented as a sum over the spins of an amplitude for a spin network whose graph is a composition of the the wavefunction spin network graph with the dual one-complex graph and the tetrahedron graphs for a triangulation of the spatial 3-manifold. This spin-network amplitude can be represented as a product of 6j symbols, which is then used to find the large-spin asymptotics of the wavefunction. By using the Laplace method we show that the large-spin asymptotics is given by a sum of Gaussian functions. However, these Gaussian functions are not of the type which gives the correct graviton propagator.

References in corpus (8)

• LQG vertex with finite Immirzi parameter
• The loop-quantum-gravity vertex-amplitude
• Graviton propagator from background-independent quantum gravity
• Diffeomorphisms and spin foam models
• Pushing Further the Asymptotics of the 6j-symbol
• Quantum Gravity Vacuum and Invariants of Embedded Spin Networks
• Errata to "Flat Spacetime Vacuum in Loop Quantum Gravity"
• Spin Network Wavefunction and the Graviton Propagator