Ontological models for relativistic quantum information

Epistemic models of nature prove to be problematic in many settings, particularly in those for which measurement procedures are ill-defined. By contrast, in ontic models of nature, measurement results are independent of the procedure used to obtain them. If we assume that all measurement results can be expressed in terms of pointer readings, then any useful ontology would need to unambiguously specify the positions of things. We review a number of proposals for such ontologies in the context of relativistic quantum information and quantum many-body theories, and we propose a new ontology based on the Wheeler-DeWitt equation that overcomes some of the problems inherent in existing models. Our model includes a set of deterministic constraints for the geometry, matter field, and action.