Form factors of descendant operators: free field construction and reflection relations

Abstract

The free field representation for form factors in the sinh-Gordon model and the sine-Gordon model in the breather sector are modified to describe the form factors of descendant operators, which are obtained from the exponential ones, eiαφ, by means of the action of the Heisenberg algebra associated with the field φ(x). As a check of the validity of the construction, we count the numbers of operators defined by the form factors at each level in each chiral sector. Another check is related to the so-called reflection relations, which identify in the breather sector the descendants of the exponential fields eiαφ and for generic values of α. We prove the operators defined by the obtained families of form factors to satisfy such reflection relations. A generalization of the construction for form factors to the kink sector is also proposed.