Graviton propagator from background-independent quantum gravity.
We study the graviton propagator in Euclidean loop quantum gravity. We use spin foam, boundary-amplitude, and group-field-theory techniques. We compute a component of the propagator to first order, under some approximations, obtaining the correct large-distance behavior. This indicates a way for deriving conventional spacetime quantities from a background-independent theory.
Rovelli
Carlo
C
Centre de Physique Théorique de Luminy, Université de la Méditerranée, F-13288 Marseille, France, EU.