Flat Spacetime Vacuum in Loop Quantum Gravity

Details Flat Spacetime Vacuum in Loop Quantum Gravity Flat Spacetime Vacuum in Loop Quantum Gravity

2004-04-06

arxiv.org/abs/gr-qc/0404021v1

Class.Quant.Grav.21:3909-3922,2004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, 6 figures

Scientific paper

10.1088/0256-307X/21/8/007

We construct a state in the loop quantum gravity theory with zero cosmological constant, which should correspond to the flat spacetime vacuum solution. This is done by defining the loop transform coefficients of a flat connection wavefunction in the holomorphic representation which satisfies all the constraints of quantum General Relativity and it is peaked around the flat space triads. The loop transform coefficients are defined as spin foam state sum invariants of the spin networks embedded in the spatial manifold for the SU(2) quantum group. We also obtain an expression for the vacuum wavefunction in the triad represntation, by defining the corresponding spin networks functional integrals as SU(2) quantum group state sums.

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