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Roaming form factors for the tricritical to critical Ising flow

Horváth, D., Dorey, P., Takács, G.

Published Jul 11, 2016• 0 citations
Publisher
DOI
10.1007/jhep07%282016%29051

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We study the massless flows described by the staircase model introduced by Al.B. Zamolodchikov through the analytic continuation of the sinh-Gordon S-matrix, focusing on the renormalisation group flow from the tricritical to the critical Ising model. We show that the properly defined roaming limits of certain sinh-Gordon form factors are identical to the form factors of the order and disorder operators for the massless flow. As a by-product, we also construct form factors for a semi-local field in the sinh-Gordon model, which can be associated with the twist field in the ultraviolet limiting free massless bosonic theory.