Finite temperature correlation functions in integrable quantum field theories are formulated only in terms of the usual, temperature-independent form factors, and certain thermodynamic filling fractions which are determined from the thermodynamic Bethe ansatz. Explicit expressions are given for the one- and two-point functions.

arXiv:hep-th/9902075Nuclear Physics BJul 1, 1999160 citations

Form factor approach to correlation functions in integrable quantum field theories

Giuseppe Mussardo

Jan 1, 19940 citations

arXiv:hep-th/9310130 · Physics Letters B

Two-point correlation function in integrable QFT with anti-crossing symmetry

G. Delfino, G. Mussardo

Published Mar 1, 1994• 37 citations

arXiv HTML PDF

DOI: 10.1016/0370-2693(94)00109-x

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The two-point correlation function of the stress-energy tensor for the

\\Phi_{1,3}

massive deformation of the non-unitary model

{\\cal M}_{3,5}

is computed. We compare the ultraviolet CFT perturbative expansion of this correlation function with its spectral representation given by a summation over matrix elements of the intermediate asymptotic massive particles. The fast rate of convergence of both approaches provides an explicit example of an accurate interpolation between the infrared and ultraviolet behaviours of a Quantum Field Theory.