Form factor approach to diagonal finite volume matrix elements in integrable QFT. (English) Zbl 1342.81649
Summary: 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.
MSC:
| 81U20 | \(S\)-matrix theory, etc. in quantum theory |
| 81R12 | Groups and algebras in quantum theory and relations with integrable systems |
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