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Construction of Quantum Field Theories with Factorizing S-Matrices

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Abstract

A new approach to the construction of interacting quantum field theories on two-dimensional Minkowski space is discussed. In this program, models are obtained from a prescribed factorizing S-matrix in two steps. At first, quantum fields which are localized in infinitely extended, wedge-shaped regions of Minkowski space are constructed explicitly. In the second step, local observables are analyzed with operator-algebraic techniques, in particular by using the modular nuclearity condition of Buchholz, d’Antoni and Longo.

Besides a model-independent result regarding the Reeh–Schlieder property of the vacuum in this framework, an infinite class of quantum field theoretic models with non-trivial interaction is constructed. This construction completes a program initiated by Schroer in a large family of theories, a particular example being the Sinh-Gordon model. The crucial problem of establishing the existence of local observables in these models is solved by verifying the modular nuclearity condition, which here amounts to a condition on analytic properties of form factors of observables localized in wedge regions.

It is shown that the constructed models solve the inverse scattering problem for the considered class of S-matrices. Moreover, a proof of asymptotic completeness is obtained by explicitly computing total sets of scattering states. The structure of these collision states is found to be in agreement with the heuristic formulae underlying the Zamolodchikov-Faddeev algebra.

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  1. Erwin Schrödinger Institute for Mathematical Physics, Boltzmanngasse 9, A-1090, Vienna, Austria

    Gandalf Lechner

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  1. Gandalf Lechner
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Communicated by Y. Kawahigashi

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Lechner, G. Construction of Quantum Field Theories with Factorizing S-Matrices. Commun. Math. Phys. 277, 821–860 (2008). https://doi.org/10.1007/s00220-007-0381-5

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