Form factors of descendant operators: Resonance identities in the sinh-Gordon model

Abstract

We study the space of local operators in the sinh-Gordon model in the framework of the bootstrap form factor approach. Our final goal is to identify the operators obtained by solving bootstrap equations with those defined in terms of the Lagrangian field. Here we try to identify operators at some very particular points, where the phenomenon of operator resonance takes place. The operator resonance phenomenon being perturbative, nevertheless, results in exact identities between some local operators. By applying an algebraic approach developed earlier for form factors we derive an infinite set of identities between particular descendant and exponential operators in the sinh-Gordon theory, which generalize the quantum equation of motion. We identify the corresponding descendant operators by comparing them with the result of perturbation theory.

arXiv comment17 pages; v2: misprints corrected

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Cited by in corpus (4)

• The complex sinh-Gordon model: form factors of descendant operators and current-current perturbations
• On convergence of form factor expansions in the infinite volume quantum Sinh-Gordon model in 1+1 dimensions
• Form factors of descendant operators: Reduction to perturbed $M(2,2s+1)$ models
• Note on four-particle form factors of operators $T_{2n}{T}_{-2n}$ in sinh-Gordon model