Essential duality in AQFT is equivalent to the local algebra being maximal among von Neumann algebra extensions whose inner automorphisms are non-signalling.
Von Neumann algebras of local observables for free scalar field.Journal of Mathematical Physics, 5:1–13, 1964
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Essential Duality and Maximal Non-signalling Extensions in Algebraic Quantum Field Theory
Essential duality in AQFT is equivalent to the local algebra being maximal among von Neumann algebra extensions whose inner automorphisms are non-signalling.