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

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.

41 pages Latex, five eps figures incorporated. Uses special macros

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• Heisenberg's Uncertainty Relation and Bell Inequalities in High Energy Physics
• Measurement of the charge asymmetry for the $K_S\to \pi e\nu$ decay and test of CPT symmetry with the KLOE detector
• Comments on Ultra-High-Energy Photons and D-Foam models
• Some exact results on CP and CPT violations in a $C=-1$ entangled pseudoscalar neutral meson pair
• On the Role of Space-Time Foam in Breaking Supersymmetry via the Barbero-Immirzi Parameter
• CP and CPT Violating Parameters Determined from the Joint Decays of $C=+1$ Entangled Neutral Pseudoscalar Mesons
• Singular lensing from the scattering on special space-time defects
• Exact Theorems Concerning CP and CPT Violations in C=-1 Entangled State of Pseudoscalar Neutral Mesons
• Effects on neutrino propagation in space-time foam of D-branes revisited
• Extracting Rephase-invariant CP and CPT Violating Parameters from Asymmetries of Time-Ordered Integrated Rates of Correlated Decays of Entangled Mesons
• A Novel Foamy Origin for Singlet Fermion Masses
• Constraints to Lorentz violation and ultrahigh-energy electrons in D-foamy space-times
• Quantum Gravity, Flavour Vacua and Supersymmetry
• Indications against dynamical CPT symmetry restoration in quantum gravity
• Bound on dissipative effects from semileptonic neutral B-meson decays
• Constraining D-foam via the 21-cm Line
• Finsler metrics and CPT