Comment on ‘Small Lorentz violations in quantum gravity: do they lead to unacceptably large effects?’
Abstract
A recent paper by Gambini et al (2011 Class. Quantum Grav. 28 155005) investigates the important issue of constraints from Lorentz invariance on Planck scale physics, arguing that the classic analysis of Collins et al (2004 Phys. Rev. Lett. 93 191301) is not generally valid. We argue that the new work is based on models that do not capture the relevant physics and that almost all models of observable high-energy Lorentz violation, and proposed Lorentz-violating theories of quantum gravity, are ruled out by low-energy tests; the only known exceptions are based on supersymmetry.
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