Graviton propagator as a tool to test spinfoam models

Details Graviton propagator as a tool to test spinfoam models Graviton propagator as a tool to test spinfoam models

2009-03-25

arxiv.org/abs/0903.4329v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

to appear in the Proceedings of the 3rd Stueckelberg Workshop on Relativistic Field Theories, July 2008, Pescara - Italy

Scientific paper

I briefly review the advancements in the construction of the graviton propagator in the context of LQG and Spinfoam Models. In particular the problems of the Barrett-Crane vertex in giving the correct long-distance limit and the introduction of the new corrected models. This kind of calculation applied to an alternative vertex with given asymptotic can give the correct propagator and is then able to help selecting spinfoam models. In particular the study of the asymptotic properties of the new models shows the predicted behavior able to overcome the BC difficulties and to give the correct propagator

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