Finite-Volume Form Factors in Semiclassical Approximation
arXiv:hep-th/0307125 · doi:10.1016/j.nuclphysb.2003.08.017
Abstract
A semiclassical approach is used to obtain Lorentz covariant expressions for the form factors between the kink states of a quantum field theory with degenerate vacua. Implemented on a cylinder geometry it provides an estimate of the spectral representation of correlation functions in a finite volume. Illustrative examples of the applicability of the method are provided by the Sine-Gordon and the broken ϕ^4 theories in 1+1 dimensions.
17 pages, latex, 1 figure
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