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Boundary S-Matrix and Boundary State in Two-Dimensional Integrable Quantum Field Theory

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arxiv hep-th/9306002 v2 pith:UAIPDINJ submitted 1993-06-02 hep-th

classification hep-th
keywords boundaryfieldtheoryintegrables-matricess-matrixtwo-dimensionalanalog
verification ladder T0 review T1 audit T2 compute T3 formal

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We study integrals of motion and factorizable S-matrices in two-dimensional integrable field theory with boundary. We propose the ``boundary cross-unitarity equation'' which is the boundary analog of the cross-symmetry condition of the ``bulk'' S-matrix. We derive the boundary S-matrices for the Ising field theory with boundary magnetic field and for the boundary sine-Gordon model.

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