Form factor expansion for thermal correlators
arXiv:1008.3810 · doi:10.1088/1742-5468/2010/11/P11012
Abstract
We consider finite temperature correlation functions in massive integrable Quantum Field Theory. Using a regularization by putting the system in finite volume, we develop a novel approach (based on multi-dimensional residues) to the form factor expansion for thermal correlators. The first few terms are obtained explicitly in theories with diagonal scattering. We also discuss the validity of the LeClair-Mussardo proposal.
41 pages; v2: minor corrections, v3: minor corrections
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