CPT and Decoherence in Quantum Gravity

TL;DR

This paper reviews theoretical motivations and experimental tests for CPT violation and decoherence effects in quantum gravity models, highlighting neutral meson experiments as potential evidence for QG-induced decoherence.

Contribution

It provides a comprehensive overview of CPT violation sources in quantum gravity and discusses how neutral meson experiments can detect QG-induced decoherence effects.

Findings

Neutral meson factories can test QG decoherence models.

QG effects may cause CPT violation distinguishable in experiments.

Potential observation of QG-induced modifications in EPR correlations.

Abstract

In this review, I first discuss briefly some theoretical motivations for potential Lorentz Violation and deviation from ordinary quantum mechanical behavior (decoherence) of field theoretic systems in the background of some quantum gravity (QG) models. Both types of effects lead to CPT violation, but they can be disentangled experimentally. I, then, proceed to a description of precision tests of CPT symmetry using neutral and charged Kaons, which are of direct relevance to the main theme of this conference. I emphasize the potentially unique r\^ole of neutral meson factories in providing ``smoking-gun'' evidence of some QG-decoherence models in which the CPT quantum mechanical operator is not well defined. This is achieved by means of potential observations of QG-induced modifications of the pertinent Einstein-Podolsky-Rosen (EPR) particle correlations.