Form factor approach to diagonal finite volume matrix elements in Integrable QFT

preprint2013arXivOpen access

Abstract

We derive an exact formula for finite volume excited state mean values of local operators in 1+1 dimensional Integrable QFT with diagonal scattering. Our result is a non-trivial generalization of the LeClair-Mussardo series, which is a form factor expansion for finite size ground state mean values.

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