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Propagator with Positive Cosmological Constant in the 3D Euclidian Quantum Gravity Toy Model

We study the propagator on a single tetrahedron in a three dimensional toy model of quantum gravity with positive cosmological constant. The cosmological constant is included in the model via q-deformation of the spatial symmetry algebra, that is, we use the Tuarev-Viro amplitude. The expected repulsive effect of dark energy is recovered in numerical and analytic calculations of the propagator at large scales comparable to the infrared cutoff. However, due to the simplicity of the model we do not obtain the exact Newton limit of the propagator. This is a first step toward the similar calculation in the full 3+1 dimensional theory with larger numbers of simplicies.

preprint2014arXivOpen access
William BuntingCarlo Rovelli
gr-qc
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William BuntingCarlo Rovelli

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