Journal
GENERAL RELATIVITY AND GRAVITATION
Volume 43, Issue 12, Pages 3569-3592Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10714-011-1252-0
Keywords
Loop quantum gravity; Scalar field; Lorentz invariance
Funding
- Hearne Institute for Theoretical Physics
- FQXi
- CCT-LSU
- Pedeciba
- John Templeton Foundation
- [NSF-PHY-0650715]
- [ANII PDT63/076]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0968871] Funding Source: National Science Foundation
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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.
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