The loop-quantum-gravity vertex-amplitude

Details The loop-quantum-gravity vertex-amplitude The loop-quantum-gravity vertex-amplitude

2007-05-16

arxiv.org/abs/0705.2388v1

Phys.Rev.Lett.99:161301,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6pages

Scientific paper

10.1103/PhysRevLett.99.161301

Spinfoam theories are hoped to provide the dynamics of non-perturbative loop quantum gravity. But a number of their features remain elusive. The best studied one -the euclidean Barrett-Crane model- does not have the boundary state space needed for this, and there are recent indications that, consequently, it may fail to yield the correct low-energy $n$-point functions. These difficulties can be traced to the SO(4) -> SU(2) gauge fixing and the way certain second class constraints are imposed, arguably incorrectly, strongly. We present an alternative model, that can be derived as a bona fide quantization of a Regge discretization of euclidean general relativity, and where the constraints are imposed weakly. Its state space is a natural subspace of the SO(4) spin-network space and matches the SO(3) hamiltonian spin network space. The model provides a long sought SO(4)-covariant vertex amplitude for loop quantum gravity.

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