Theoretical Analysis of CPT and Lorentz Tests in Penning Traps

TL;DR

This paper provides a theoretical framework for analyzing potential CPT and Lorentz symmetry violations in Penning trap experiments, extending the standard model to include possible symmetry-breaking effects from fundamental theories like string theory.

Contribution

It introduces a detailed theoretical analysis within the Standard-Model Extension framework for interpreting CPT and Lorentz tests in Penning traps, including potential signals and bounds.

Findings

Identifies possible signals of CPT and Lorentz violation in Penning trap experiments.

Estimates bounds on symmetry violations achievable with current and future experiments.

Provides a theoretical basis for interpreting experimental results in terms of fundamental symmetry breaking.

Abstract

The CPT theorem has been tested to very high precision in a variety of experiments involving particles and antiparticles confined within Penning traps. These tests include comparisons of anomalous magnetic moments and charge-to-mass ratios of electrons and positrons, protons and antiprotons, and hydrogen ions and antiprotons. We present a theoretical analysis of possible signals for CPT and Lorentz violation in these systems. We use the framework of Colladay and Kosteleck\'y, which consists of a general extension of the $SU(3) \times SU(2) \times U(1)$ standard model including possible CPT and Lorentz violations arising from spontaneous symmetry breaking at a fundamental level, such as in string theory. We work in the context of an extension of quantum electrodynamics to examine CPT and Lorentz tests in Penning traps. Our analysis permits a detailed study of the effectiveness of experimental tests of CPT and Lorentz symmetry performed in Penning traps. We describe possible signals that might appear in principle, and estimate bounds on CPT and Lorentz violation attainable in present and future experiments.