Finite temperature correlation functions from form factors

Abstract

We investigate proposals of how the form factor approach to compute correlation functions at zero temperature can be extended to finite temperature. For the two-point correlation function we conclude that the suggestion to use the usual form factor expansion with the modification of introducing dressing functions of various kinds is only suitable for free theories. Dynamically interacting theories require a more severe change of the form factor program.

22 pages Latex, 3 figures

References in corpus (3)

• On the Finite Temperature Formalism in Integrable Quantum Field Theories
• One-point functions in integrable quantum field theory at finite temperature
• Form factors from free fermionic Fock fields, the Federbush model

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