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Wavefront sets in algebraic quantum field theory. (English) Zbl 1157.81325

Summary: The investigation of wavefront sets of \(n\)-point distributions in quantum field theory has recently acquired some attention stimulated by results obtained with the help of concepts from microlocal analysis in quantum field theory in curved spacetime. In the present paper, the notion of wavefront set of a distribution is generalized so as to be applicable to states and linear functionals on nets of operator algebras carrying a covariant action of the translation group in arbitrary dimension. In the case where one is given a quantum field theory in the operator algebraic framework, this generalized notion of wavefront set, called “asymptotic correlation spectrum”, is further investigated and several of its properties for physical states are derived. We also investigate the connection between the asymptotic correlation spectrum of a physical state and the wavefront sets of the corresponding Wightman distributions if there is a Wightman field affiliated to the local operator algebras. Finally we present a new result (generalizing known facts) which shows that certain spacetime points must be contained in the singular supports of the \(2n\)-point distributions of a non-trivial Wightman field.

MSC:

81T05 Axiomatic quantum field theory; operator algebras
81T20 Quantum field theory on curved space or space-time backgrounds
46L60 Applications of selfadjoint operator algebras to physics
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