The general properties of the factorized S-matrix in two-dimensional space-time are
considered. The relation between the factorization property of the scattering theory and the …

The Fermi gas model of one-dimensional conductors is reviewed. The exact solutions
known for particular values of the coupling constants in a single chain problem (Tomonaga …

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 …

The development of Relativistic Quantum Field Theory started in 1932 as a natural
extension of Quantum Mechanics to the relativistic domain [1]. The work of Feynman in the …

We discuss Polyakov's quantization of the string in the presence of a boundary allowing for
an arbitrary topology for the world sheet. In addition to the dynamical conformal factor …

A systematic renormalisation group technique for studying the 2D sine-Gordon theory
(Coulomb gas, XY model) near its phase transition is presented. The new results are (a) …

A review is given of the derivation of exact S-matrices in field theoretic models with soliton
behaviour, that means models obeying infinitely many conservation laws which imply the …

The Hamiltonian of the massive Thirring model is explicitly diagonalized by formulating a
Bethe ansatz for the eigenstates. The physical states are described by many-body wave …

We show that the two-dimensional (ψ ψ) 2 model is, for N= 3, equivalent to the
supersymmetric sine-Gordon equation, and for N= 4, equivalent to two decoupled sine …

We show that the sin/cos functions of the axial potential of the free massive Dirac field
appropriately describe the correlation functions of the (T> T c order/disorder variable of two …