New Observational Bounds to Quantum Gravity Signals

TL;DR

This paper uses existing experimental data to set new, more stringent bounds on quantum gravity effects related to spacetime fluctuations, challenging some Lorentz-violating theories with linear corrections.

Contribution

It introduces tighter observational bounds on quantum gravity-induced field propagation effects, questioning linear correction models in Lorentz-violating theories.

Findings

Experimental bounds surpass previous astrophysical limits

Results challenge linear-in-$l_P$ quantum gravity corrections

Supports the need for revised models of quantum gravity effects

Abstract

We consider a new set of effects arising from the quantum gravity corrections to the propagation of fields, associated with fluctuations of the spacetime geometry. Using already existing experimental data, we can put bounds on these effects that are more stringent by several orders of magnitude than those expected to be obtained in astrophysical observations. In fact these results can be already interpreted as questioning the whole scenario of linear (in $l_P$) corrections to the dispersion relations for free fields in Lorentz violating theories.