pith. sign in

arxiv: gr-qc/0508124 · v2 · submitted 2005-08-30 · 🌀 gr-qc · hep-th

Graviton propagator from background-independent quantum gravity

Carlo Rovelli This is my paper
classification 🌀 gr-qc hep-th
keywords propagatorgravitongravityquantumactionamplitudeapproximationsbackground-independent
0
0 comments X
read the original abstract

We study the graviton propagator in euclidean loop quantum gravity, using the spinfoam formalism. We use boundary-amplitude and group-field-theory techniques, and compute one component of the propagator to first order, under a number of approximations, obtaining the correct spacetime dependence. In the large distance limit, the only term of the vertex amplitude that contributes is the exponential of the Regge action: the other terms, that have raised doubts on the physical viability of the model, are suppressed by the phase of the vacuum state, which is determined by the extrinsic geometry of the boundary.

This paper has not been read by Pith yet.

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Toller matrices and the Feynman $i\varepsilon$ in spinfoams

    gr-qc 2026-04 unverdicted novelty 7.0

    Toller matrices T^(±) in causal spinfoam amplitudes satisfy T^(+) + T^(-) = D and admit equivalent definitions via analyticity, iε prescription, and boost-eigenvalue integrals that reproduce the Euclidean-to-Lorentzia...