Form factor approach to diagonal finite volume matrix elements in
Integrable QFT [PDF]
B. PozsgayWe 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.View original: http://arxiv.org/abs/1305.3373
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