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

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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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  1. MTA-BME “Momentum” Statistical Field Theory Research Group, 1111, Budapest, Budafoki út 8, Hungary

    Balázs Pozsgay

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  1. Balázs Pozsgay
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Correspondence to Balázs Pozsgay.

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ArXiv ePrint: 1305.3373

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Pozsgay, B. Form factor approach to diagonal finite volume matrix elements in Integrable QFT. J. High Energ. Phys. 2013, 157 (2013). https://doi.org/10.1007/JHEP07(2013)157

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  • DOI: https://doi.org/10.1007/JHEP07(2013)157

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