This paper describes the quantum theory of solitons  the localized solutions of the classical field equations. The scattering matrix for the processes with solitons is defined within the functional integral formalism. The Lorentzinvariant perturbation theory for solitons is consistently set up. The physical properties of solitons are calculated for twodimensional scalar theories in the oneloop approximation.

Authors: Faddeev L.D., Korepin V.E.  Pages: 87 Year: 1987 
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