Lorentz and CPT tests with spin-polarized solids

TL;DR

This paper discusses how experiments with spin-polarized solids can test fundamental Lorentz and CPT symmetry violations, offering sensitivity comparable to all other methods and potential insights into Planck-scale physics.

Contribution

It highlights the potential of macroscopic spin-polarized matter experiments to detect Lorentz and CPT violations at unprecedented sensitivity levels.

Findings

Existing experiments with spin-polarized torsion pendulums have high sensitivity.

These experiments can rival all other tests in the electron sector.

Potential to detect spontaneous Lorentz symmetry violation at the Planck scale.

Abstract

Experiments using macroscopic samples of spin-polarized matter offer exceptional sensitivity to Lorentz and CPT violation in the electron sector. Data from existing experiments with a spin-polarized torsion pendulum provide sensitivity in this sector rivaling that of all other existing experiments and could reveal spontaneous violation of Lorentz symmetry at the Planck scale.