Planck-scale gravity test at PETRA -- Letter of Intent
Vahagn Gharibyan, Klaus Balewski

TL;DR
This paper proposes a novel laboratory experiment using PETRA to test quantum or torsion gravity models by measuring space birefringence or refractivity at unprecedented sensitivity levels, potentially probing Planck-scale physics.
Contribution
It introduces a new experimental approach to detect Planck-scale effects in space-time using laser Compton scattering at PETRA.
Findings
Potential sensitivity of 10^{-31}m for doubly refractive vacuum
Potential sensitivity of 10^{-28}m for singly refractive vacuum
Feasibility of testing quantum gravity models in laboratory conditions
Abstract
Quantum or torsion gravity models predict unusual properties of space-time at very short distances. In particular, near the Planck length, around , empty space may behave as a crystal, singly or doubly refractive. This hypothesis, however, remains uncheckable for any direct measurement since the smallest distance accessible in experiment is about at the LHC. Here we propose a laboratory test to measure space birefringence or refractivity induced by gravity. A sensitivity for doubly and for singly refractive vacuum could be reached with PETRA 6 GeV beam exploring UV laser Compton scattering.
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