Form factors of descendant operators: free field construction and reflection relations
Abstract
The free field representation for form factors in the sinhGordon model and the sineGordon model in the breather sector are modified to describe the form factors of descendant operators, which are obtained from the exponential ones, e^{iαphiv}, by means of the action of the Heisenberg algebra associated with the field phiv(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 socalled reflection relations, which identify in the breather sector the descendants of the exponential fields e^{iαphiv} and e^{i(2\alpha_0\alpha)\varphi} 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.
 Publication:

Journal of Physics A Mathematical General
 Pub Date:
 July 2009
 DOI:
 10.1088/17518113/42/30/304014
 arXiv:
 arXiv:0812.4776
 Bibcode:
 2009JPhA...42D4014F
 Keywords:

 Mathematical Physics;
 High Energy Physics  Theory;
 Nonlinear Sciences  Exactly Solvable and Integrable Systems
 EPrint:
 29 pages