Quantum gravity forces the QCD theta parameter to emerge as the vev of a local axion field through coherent-state representations of geometry and a quantum-information interpretation of topological-charge superselection.
Building up spacetime with quan- tum entanglement,
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Gravity, Superselection Rules and Axions
Quantum gravity forces the QCD theta parameter to emerge as the vev of a local axion field through coherent-state representations of geometry and a quantum-information interpretation of topological-charge superselection.