Finite-Volume Form Factors in Semiclassical
Approximation
by Riva, Valentina
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 $\phi^4$ theories in 1+1 dimensions.
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