On alternative approaches to Lorentz violation in loop quantum gravity inspired models

Details On alternative approaches to Lorentz violation in loop quantum gravity inspired models On alternative approaches to Lorentz violation in loop quantum gravity inspired models

2004-04-27

arxiv.org/abs/gr-qc/0404113v2

Phys.Rev. D70 (2004) 084002

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages, revtex4, no figures, references added

Scientific paper

10.1103/PhysRevD.70.084002

Recent claims point out that possible violations of Lorentz symmetry appearing in some semiclassical models of extended matter dynamics motivated by loop quantum gravity can be removed by a different choice of canonically conjugated variables. In this note we show that such alternative is inconsistent with the choice of variables in the underlying quantum theory together with the semiclassical approximation, as long as the correspondence principle is maintained. A consistent choice will violate standard Lorentz invariance. Thus, to preserve a relativity principle in this framework, the linear realization of Lorentz symmetry should be extended or superseded.

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