Quantum-gravity-motivated Lorentz-symmetry tests with laser interferometers

TL;DR

This paper explores how quantum gravity-inspired modifications to particle propagation could produce detectable signatures in laser interferometry, potentially allowing Planck-scale sensitivity despite significant technological challenges.

Contribution

It identifies specific interferometric setups capable of detecting Planck-scale effects from quantum gravity modifications in particle propagation.

Findings

Certain interferometric configurations can reveal Planck-scale effects.

Estimated sensitivity approaches Planck-scale, but faces technological hurdles.

Potential to connect quantum gravity theories with experimental tests.

Abstract

We consider the implications for laser interferometry of the quantum-gravity-motivated modifications in the laws of particle propagation, which are presently being considered in attempts to explain puzzling observations of ultra-high-energy cosmic rays. We show that there are interferometric setups in which the Planck-scale effect on propagation leads to a characteristic signature. A naive estimate is encouraging with respect to the possibility of achieving Planck-scale sensitivity, but we also point out some severe technological challenges which would have to be overcome in order to achieve this sensitivity.