Journal
NUCLEAR PHYSICS B
Volume 670, Issue 3, Pages 464-478Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2003.08.017
Keywords
form factors; kink solutions in finite volume; spectral density in finite volume
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A semi-classical 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. (C) 2003 Elsevier B.V. All rights reserved.
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