Decoherence and CPT Violation in a Stringy Model of Space-Time Foam

TL;DR

This paper explores a string-inspired model where our universe interacts with a space-time foam of D-particles, leading to decoherence and CPT violation effects that could impact neutral meson entanglement experiments.

Contribution

It introduces a novel string/brane model of space-time foam causing decoherence and CPT violation, with potential experimental implications for neutral meson systems.

Findings

Decoherence arises from string-D-particle interactions modeled by logarithmic conformal field theories.

CPT violation manifests as an ill-defined CPT operator in the effective theory.

Potential observable effects on EPR correlations in neutral meson experiments.

Abstract

I discuss a model inspired from the string/brane framework, in which our Universe is represented as a three brane, propagating in a bulk space time punctured by D0-brane (D-particle) defects. As the D3-brane world moves in the bulk, the D-particles cross it, and from an effective observer on D3 the situation looks like a ``space-time foam'' with the defects ``flashing'' on and off (``D-particle foam''). The open strings, with their ends attached on the brane, which represent matter in this scenario, can interact with the D-particles on the D3-brane universe in a topologically non-trivial manner, involving splitting and capture of the strings by the D0-brane defects. Such processes are described by logarithmic conformal field theories on the world-sheet. Physically, they result in effective decoherence of the string matter on the D3 brane, and as a result, of CPT Violation, but of a type that implies an ill-defined nature of the effective CPT operator. Due to electric charge conservation, only electrically neutral (string) matter can exhibit such interactions with the D-particle foam. This may have unique, experimentally detectable, consequences for electrically-neutral entangled quantum matter states on the brane world, in particular the modification of the pertinent EPR Correlation of neutral mesons in a meson factory.