Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case

Details Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case

2011-05-03

arxiv.org/abs/1105.0667v2

Gen. Rel. Grav. 43 3569-3592 (2011)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Dedicated to Josh Goldberg, to appear in special issue of Gen. Rel. Grav., 14 pages RevTex. We expanded the section on Lorentz

Scientific paper

10.1007/s10714-011-1252-0

We recently studied gravity coupled to a scalar field in spherical symmetry using loop quantum gravity techniques. Since there are local degrees of freedom one faces the "problem of dynamics". We attack it using the "uniform discretization technique". We find the quantum state that minimizes the value of the master constraint for the case of weak fields and curvatures. The state has the form of a direct product of Gaussians for the gravitational variables times a modified Fock state for the scalar field. In this paper we do three things. First, we verify that the previous state also yields a small value of the master constraint when one polymerizes the scalar field in addition to the gravitational variables. We then study the propagators for the polymerized scalar field in flat space-time using the previously considered ground state in the low energy limit. We discuss the issue of the Lorentz invariance of the whole approach. We note that if one uses real clocks to describe the system, Lorentz invariance violations are small. We discuss the implications of these results in the light of Horava's Gravity at the Lifshitz point and of the argument about potential large Lorentz violations in interacting field theories of Collins et. al.

Affiliated with

Also associated with

No associations

Rating

Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum scalar field in quantum gravity: the propagator and Lorentz invariance in the spherically symmetric case will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-694747