Small Lorentz violations in quantum gravity: do they lead to unacceptably large effects?

Details Small Lorentz violations in quantum gravity: do they lead to unacceptably large effects? Small Lorentz violations in quantum gravity: do they lead to unacceptably large effects?

2011-06-07

arxiv.org/abs/1106.1417v1

Class. Quantum Grav. 28 155005 (2011)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 1 figure, Revtex, to appear in Class. Quan. Grav

Scientific paper

10.1088/0264-9381/28/15/155005

We discuss the applicability of the argument of Collins, P\'erez, Sudarsky, Urrutia and Vucetich to loop quantum gravity. This argument suggests that Lorentz violations, even ones that only manifest themselves at energies close to the Planck scale, have significant observational consequences at low energies when one considers perturbative quantum field theory and renormalization. We show that non-perturbative treatments like those of loop quantum gravity may generate deviations of Lorentz invariance of a different type than those considered by Collins et al. that do not necessarily imply observational consequences at low energy.

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