A system of equations is derived which must be satisfied by multiparticle matrix elements of any local operator in field theories with soliton behaviour. Form factors of various operators of interest… (More)

We provide detailed arguments on how to derive properties of generalized form factors, originally proposed by one of the authors (M.K.) and Weisz twenty years ago, solely based on the assumption of… (More)

The purpose of the \bootstrap program" for integrable quantum eld theories in 1+1 dimensions is to construct a model in terms of its Wightman functions explicitly. In this article, this program is… (More)

We extend the combinatorial construction of invariants of smooth, compact closed 3-manifolds as given by Turaev and Viro to obtain invariants of 3-manifolds with boundary. The technique uses quantum… (More)

Using the methods of the “form factor program” exact expressions of all matrix elements are obtained for several operators of the quantum sine-Gordon model alias the massive Thirring model. A general… (More)

The form factor equations are solved for a SU(N) invariant S-matrix under the assumption that the anti-particle is identified with the bound state of N − 1 particles. The solution is obtained… (More)

The combinatorial state sum of Turaev and Viro for a compact 3-manifold in terms of quantum 6j-symbols is generalized by introducing observables in the form of coloured graphs. They satisfy braiding… (More)

We investigate the algebraic structure of the supersymmetric t-J model in one dimension. We prove that the Bethe ansatz states are highest weight vectors of an spl(2,1) superalgebra. By acting with… (More)

In theoretical elementary particle physics quantum field theory has gained renewed interest in the last years. Non-Abelian gauge theories unify weak and electromagnetic interactions and QCD seems to… (More)

A variety of two-&menslonal field theories have the property of being completely mtegrable at the classical level and describe Interactions of solitons. In the cases investigated so far, the most… (More)