Haag-Ruelle Scattering Theory
In order that quantum field theory may serve as a basis for elementary particle theory, it must contain the necessary components of relativistic collision theory. According to §7.3.E, this requires the Fock space H of (asymptotically) free particles and two Poincaré-invariant isometric operators Ωin and Ωout from H to the physical Hilbert space Η. (We shall use the common notation Ωex, where the symbol ex takes the two values: in and out).*
KeywordsVacuum Expectation Asymptotic State Cluster Property Positive Mass Isometric Operator
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