Constraints on Lorentz violation from clock-comparison experiments

TL;DR

This paper analyzes how clock-comparison experiments can set bounds on Lorentz and CPT symmetry violations within a general extension of the standard model, highlighting species-dependent sensitivities and potential for probing Planck-scale physics.

Contribution

It provides a comprehensive framework connecting clock experiments to Lorentz violation constraints, emphasizing species-dependent effects and future experimental considerations.

Findings

Certain clock experiments are sensitive to different Lorentz violations.

Experiments can potentially detect Planck-scale Lorentz-violating physics.

Species used as clocks influence the bounds on Lorentz violation.

Abstract

Constraints from clock-comparison experiments on violations of Lorentz and CPT symmetry are investigated in the context of a general Lorentz-violating extension of the standard model. The experimental signals are shown to depend on the atomic and ionic species used as clocks. Certain experiments usually regarded as establishing comparable bounds are in this context sensitive to different types of Lorentz violation. Some considerations relevant to possible future measurements are presented. All these experiments are potentially sensitive to Lorentz-violating physics at the Planck scale.