Graviton Propagator from Background-Independent Quantum Gravity
Abstract
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.
- Publication:
-
Physical Review Letters
- Pub Date:
- October 2006
- DOI:
- 10.1103/PhysRevLett.97.151301
- arXiv:
- arXiv:gr-qc/0508124
- Bibcode:
- 2006PhRvL..97o1301R
- Keywords:
-
- 04.60.Pp;
- 04.62.+v;
- Loop quantum gravity quantum geometry spin foams;
- Quantum field theory in curved spacetime;
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- E-Print:
- 6 pages. Substantially revised second version. Improved boundary state ansatz